Question

Joshua spent 3/7 of his money on souvenirs on vacation. He has $16 left, How much money did he spent on souvenirs?

Answer 1

3a/7 +16 = a
(7a/7) - (3a/7) = 16
a(7-3)/7 = 16
4a/7 = 16
a = 16*7/4
a = 28
Joshua has been $28

28-16 = 12
Joshua spent in souvenirs:
$12