Unit 6 · Algebra
Charlie's $9 Lunch — What Did Alex Spend?
Lesson 12 of 24
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About this lesson
Alex → spends some → gives half to Charlie → Charlie spends 1/4 of that on $9 lunch. Work backwards from the $9: un-quarter it, un-halve it, then subtract from $76.
Chapters
0:00Introduction
0:21The Question
0:56Decoding Charlie's received fund
1:25Reconstructing Alex's remaining balance
1:50Isolating the initial shop expense
2:15Exam strategy — the backwards inversion anchor
2:53Confirming the final option
Question
Alex had $76.
He spent some of it in a shop.
Then he gave half of what he had left to Charlie.
Charlie spent a quarter of what Alex gave him on lunch.
Charlie spent $9 on lunch.
How much did Alex spend in the shop?
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