Question

Suppose you receive an allowance of $55 and your friend receives an allowance of $40 at the beginning of the month. If you spend $6 a day and your friend spends $3 a day, after how many days will you and your friend have the same amount of money?

Answer 1

Answer: 5 days

Explanation:

so we need to find:

55 - 6a = 40 - 3a

with a being the days we need to find

-40 on each side

15 - 6a = -3a

+6a on each side

15 = 3a

divide each side by 3

5 = a