A 400 gram solution contains 20% salt. How many grams of salt should we add to make the solution have 30% salt?

One fourth of a number is 1 more than one fifth of the same number

I dont quite get the hang of prime numner and learning what numbers to replace the letter with i guess the basic order of operation?

Vivi is a drummer for a band. She burns 756756756 calories while drumming for 333 hours. She burns the same number of calories each hour. How many calories does Vivi burn per hour?

How to find the volume without the width

A box contains 1 3/4 pounds of beans how many ounces of beans are in the box?

At the beginning of the first day, a company has 64 shipping crates on backorder. By the end of each day, customers order 18 more shipping crates.

2/3 of a number is 12

The table represents a function. A 2-column table with 4 rows. The first column is labeled x with entries negative 4, negative 1, 3, 5. The second column is labeled f of x with entries negative 2, 5, 4, negative 8. What is f (5) ?

What is the rule for divisibility by 2?

if a certain number is added to 24, the result is the same as if the number were multiplied by 3. what is the number?