The ratio of number of lemons to number of cups of water to be mixed to prepare lemon juice is $3 : 5$ . For $12$ lemons what is the number of cups of water required?

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Solution

The correct option is C 20
Given, the ratio of number of lemons to number of cups of water $3 : 5$
$⟹$ 3 lemons are required for 5 cups of water.
12 lemons is same as $3 \times 4$ lemons.
Here 3 lemons are multiplied by 4. Hence, we need to multiply 5 cups of water also by 4.
$∴$ Water required for 12 lemons is $5 \times 4 = 20 c u p s .$

Items in the Ratio

Numbers in the ratio

Values of items used

Multiplier

Lemons

3

12
4

Cups of water

5
20 4

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Items in the Ratio	Numbers in the ratio	Values of items used	Multiplier
Lemons	3	12	4
Cups of water	5	20	4