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Rajesh's plan...

Question

Rajesh's plant grew 3 $c m$ last week. Sabina's plant grew $2 \frac{1}{2}$ times as fast as Rajesh's plant. How many centimetres did Sabina's plant grow last week?

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Solution

Rajesh's plant grew $3 c m$ last week.
Sabina's plant grew $2 \frac{1}{2} \times 3 c m = \frac{5}{2} \times 3 = \frac{15}{2} = 7.5 c m$
Sabina's plant grew 7.5cm last week.

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