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Cheryl and Marcus are going to make a two-tiered cake. The smaller tier is 2/3 the size of the larger tier. The recipe for the bottom tier calls for 3/5
cup of water. How much water will they need to make the smaller tier?

They made a model to represent the problem. Cheryl says they need 6/9 cup of water. Marcus says they need 2/5 cup of water. Who is correct? Explain.



Answer :

apologiabiology
bottom tier is the largest since it must support the most weight
2 tiers

bottom tier=3/5
smaller is 2/3 of larger=2/3 of 3/5
'of' can be translated as multply
2/3 times 3/5=6/15=2/5

so water needed for top=2/5 water

2/5 water needed for the smaller tier so Marcus is correct

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