Competition problem — Algebra — Maths Olympiad Prep

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Algebra Difficulty 2.0 Junior Find the answer

How many foonies are in a stack that has a volume of $50 \mathrm{~cm}^{3}$ , given that each foonie has a volume of $2.5 \mathrm{~cm}^{3}$ ?

Your answer

A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

Solution

Since the face of a foonie has area $5 \mathrm{~cm}^{2}$ and its thickness is 0.5 cm, then the volume of one foonie is $5 \times 0.5=2.5 \mathrm{~cm}^{3}$ . If a stack of foonies has a volume of $50 \mathrm{~cm}^{3}$ and each foonie has a volume of $2.5 \mathrm{~cm}^{3}$ , then there are $50 \div 2.5=20$ foonies in the stack.

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