Lizzy: A school bought 20 cartons of pencils at the start of school. Pencils come in cartons of 10 boxes and each box costs $2. The school also bought 10 cartons of markers. A carton has 5 boxes and costs $4. How much did the school spend in all?.
Me: Hmmm, let me think. I think this is the detailed solution:
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The school bought 20 x 10 = 200 boxes of pencils. The pencils cost 200 x $2 = $400. The school bought 10 x 5 = 50 boxes of markers. The markers cost 50 x $4 = $200. Thus, the school spent a total of $400 + $200 = $600. Final answer: 600.
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