Problem 7 · 2017 Math Kangaroo
Easy
Fractions, Decimals & Percents
area-fraction
Max colours the squares of the grid so that one third of all the squares are blue and one half are yellow. He colours the rest red. How many squares does he colour red?
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Answer: C — 3
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Hint 1 of 2
First count the squares in the grid, then find a third of them and a half of them.
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Hint 2 of 2
Red = total minus the blue third minus the yellow half.
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Approach: take fractions of the total square count
- The grid is 3 by 6, so there are 18 squares.
- One third are blue: 18÷3 = 6 squares; one half are yellow: 18÷2 = 9 squares.
- Red is the rest: 18 − 6 − 9 = 3 squares (C).
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