-
In a family of 8 adults and some minors, the average consumption of rice per head per month is 10.8 kg; while the average consumption for adults is 15 kg per head and for minors it is 6 kg per head. The number of minors in the family is :
-
- 8
- 6
- 7
- 9
- 8
Correct Option: C
Let the number of minors be y.
According to the question,
| 8 × 15 + y × 6 | = 10.8 | |
| 8 + y |
⇒ 120 + 6y = 86.4 + 10.8y
⇒ 10.8y – 6y = 120 – 86.4
⇒ 4.8y = 33.6
⇒ y = 336 ÷ 48 = 7
