Help Choose a variable to represent the number and write a variable expression for the following phrases. Example: A number multiplied by 10 —-> n x 10 or 10n 19 decreased by a number
4 less than the product of 4 and a number
30 more than a number
12 more than 3 times a number
A number divided by seven
A number and seven divided by two
16 times an unknown number
A number divided by eight
The quantity of a number and seven times two
The quantity of a number and five divided by five
22 decreased by a number
Seventeen less than three times a number
Solve each problem.
A librarian has 4 times as many mystery books as romances. She lends out 12 mysteries. How many mysteries does she have now if she started with 15 romances?