Problem 1 · 2013 Math Kangaroo
Easy
Arithmetic & Operations
careful-countingarithmetic-series
How many more bricks does the right-hand pyramid have than the left-hand pyramid?
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Answer: B — 5
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Hint 1 of 3
Count the bricks in each pyramid, going one row at a time from the top.
Still stuck? Show hint 2 →
Hint 2 of 3
Notice the right pyramid is just the left one with one extra row added at the bottom.
Still stuck? Show hint 3 →
Hint 3 of 3
So you only need to count the bricks in that one extra bottom row.
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Approach: the right pyramid is the left pyramid plus one extra bottom row
- Both pyramids look the same at the top; the right one has one more row at the bottom.
- Count that extra bottom row: it has 5 bricks.
- So the right pyramid has 5 more bricks than the left one, which is answer B.
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