Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [arithmetic]

Questions on basic arithmetic involving numerical quantities only. Questions involving variable values (other than the result of the operation) should be placed under the (algebra-precalculus) tag. Questions about number theory (sometimes called "arithmetic") should not use this tag and should instead use (number-theory) or (elementary-number-theory).

Arithmetic is defined as operations upon numbers using $4$ main operations along with many others:

addition - the sum of two numbers

subtraction - the difference of two numbers also defined as the addition of negative numbers

multiplication - the area of a rectangle with sides of lengths equal to the two operands

division - the number of times one number can be subtracted from another before equaling zero. Sometimes it will allow decimals and in other cases there will be a remainder left over when a number doesn't go into another evenly

See Arithmetic.

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Hire purchase problems

A bank offers loans at interest of $12\%$ per annum , compounded monthly. Jack took a $\$50,000$ loan and makes a monthly installment payments of $\$4200$ at the end of each month . Find his outstanding loan after his third installment payment. I'm…
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Problem solving involving profit and loss

A fruit seller buys a large quantity of apples for $\$150$. $200$ of the apples are rotten and he sells each of the remaining apples at $10$ cents more than what he paid and makes a profit of $\$50$. Find the number of apples that he brought…
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Confused between marked price , selling price , cost price

By selling an article at 20% discount off the marked price , a shop keeper still makes 10% profit on his cost . If cost price is $1200 , calculate the marked price of the article . I learned that marked price is the "base price" on an item before…
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How to find estimated total time, based on time elapsed and bytes downloaded?

I'm doing C programming exercise for college, and couldn't figure out how to calculate the following value based on four values (2 of each from one type of variable). The exercise is to write a program for a progress bar for downloading a…
user36662
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Find the sum of this given expression.....

$$1+(3+1)(3^2+1)(3^4+1)(3^8+1)(3^{16}+1)(3^{32}+1)$$
mkumar
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How to find the summation of phasors in exponential form

Is there any expression in form of $A e^{j\phi}$ for the following summation: $A_1 e^{j\phi_1} + A_2 e^{j\phi_2} + ... + A_n e^{j\phi_n}$?
Yuan
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Number patterns of fractions

I can't seem to find a difference for this number pattern .. Given a sequence ... $1, 2/3 , 4/7 , 8/15 , 16/31 ... $ What is the next term of the sequence ? I can't seem to spot a difference between them .. Anyone else can ? Thanks for the help…
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Calculating a function given a certain x range.

I have the function $f(x) = x^3 + 1$ and I want to calculate the following: $f(x) = (\frac{a}{25})^3 + 1 $ Where "$a$" is 1,2,3,4,..,50. 1 through 50 Basically I'm adding up $f(1) + f(2) + f(3) + f(4),+..,f(50)$ I want to know if there a easier way…
shawn edward
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Simple Addition Question

In basic math, when adding there is the notion of carry. For example if you have $9999+9999$, since $9+9=18$ the $1$ is leftover and carried to the top. Is there some formula that gives us the total number carried? So in the case of our example, it…
user327811
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Calculate the total error percentage

Below it the table which contains Actual Count and Error Count for each ID. USER_ID | Actual_Count | Error_Count -----------+--------------------+--------------------- 1345653 5 4 534140349 5 …
arsenal
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Carrying digit can only be 1. Why?

In the book "Algebra" by Gelfand, I have read a solution to a problem which assumes something that does not seem evident to me. Let's see: Problem 2. In the addition example: A A A + B B B = --------- A A A C all A's denote some digit, all B’s…
Eleno
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Problems involving time and speed ,

I have a test coming up and there will be a similar question like this . But I don't understand it but I got lucky during a practice . The question is - A cargo train enters a 1.8km tunnel and takes 80 seconds to emerge . The train takes another 12…
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percents off and discounts

How do you do this question: Employees of a discount appliance store recieve an additional 20% off of the lowest price on an item. If an employee purchases a dishwasher during a 15% off sale, how much will he pay if the dishwasher originally cost…
hello
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What would be a formula for this?

I'm trying to find a formula for this scenario: I need \$$302$. I gain \$$2$ every second. I gain \$$5$ every $5$ seconds. When will I reach \$$302$? Both of these rates are working together. Visually: $2 $2 $2 $2 ($2 $5) $2 $2 $2 $2 ($2 $5) I'm…
John Smith
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Using indices to find an unknown

$1458^n = 2^n / 9$ I'm told to find the value of $n$. How to do that? It is my first time encountering this type of problem when I can't find make every number a constant . What do I do here . Can I get a hint ? Thanks in advance (2 x 3^6)^n x 3^2…
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