1.

In a family of 4 adults and some minors, the average consumption of rice per head per month is 8.5 kg, while the average consumption for adults is 10 kg per head and for minor it is 5.5 kg per head. The number of minors in the family is:1. 32. 53. 44. 2

Answer» Correct Answer - Option 4 : 2

Given:

There are 4 adults and the consumption of rice per month = 10 kg per head.

The average consumption of rice per head per month is 8.5 kg.

The average consumption for adults is 10 kg per head and for minor it is 5.5 kg per head.

Solution:

Let the number of minors be x.

Number of adults = 4

Total consumption of adults = 4 × 10 kg = 40 kg

Total consumption of minors = 5.5 × x = 5.5x kg

According to the question:

(40 + 5.5x)/(4 + x) = 8.5

⇒ 40 + 5.5x = 34 + 8.5x

⇒ 40 – 34 = 8.5x – 5.5x

⇒ 3x = 6

⇒ x = 2

 ∴ The number of minors in the family is 2.


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