Question

The number of 22 cent stamps, n, can be found by solving the equation: 22n + 17(20 − n) = 400

How many 22 cent stamps are in the book?​

Answer 1

12

Explanation:

22n + 17(20 - n) = 400 ← distribute parenthesis and simplify left side

22n + 340 - 17n = 400

5n + 340 = 400 ( subtract 340 from both sides )

5n = 60 ( divide both sides by 5 )

n = 12

there are 12, 22 cent stamps in the book