If 9 five-rupee coins push up 10 mL, then 18 coins push up:
A20 mL
B30 mL
C40 mL
D15 mL
Answer & Solution
Correct answer: A. 20 mL
1. 9 coins push up 10 mL of water.
2. 18 coins is twice 9, so they push up twice as much.
3. That is 20 mL.
_Source: NCERT Class 5 Mathematics, 'Math-Magic', Ch 14 'How Big? How Heavy?'_
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