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Question
Answer
Smartwolf
$42
BigDevil
After spending $18, she had 12u left.
Original money → $18 + 12u
She then spent another 7/12 of the remainder = 7u
She was now left with 12u – 7u = 5u of her remainder
Given: 5u is 1/3 of her original money,
Original money = 5u × 3 = 15u
$18 + 12u = 15u
3u = 18
u = 6
Amount spent on Chinese story books → 7u = $42
BigDevil
Check
u = 6
Original money → 18 + 12u = 18 + 72 = $90
Spent $18, left 12u → $72
Spent 7u = $42, left → 72 – 42 = $30
$30 is 1/3 of original $90
Checked