Mei Ling had some money. She spent 2/5 of it on a story book and $12 on a pen. She had $24 left. How much money did Mei Ling have at first?
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Worked Solution
Step 1: Let total money at first = T. Money spent on book = 2/5 × T. So leftover after the book = 3/5 × T.
Step 2: After buying the pen ($12), $24 was left. So 3/5 × T − $12 = $24.
Step 3: 3/5 × T = $24 + $12 = $36.
Step 4: 1/5 × T = $36 ÷ 3 = $12. So T = 5 × $12 = $60.
Answer: $60
Correct answer: $60
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