4 boys and 3 girls spent Rs. 120 on an average, of which boys spent Rs. 150 on the average. The the average amount spent by the girls is-

A. Rs. 80 B. Rs. 60 C. Rs. 90 D. Rs. 100 Answer: Option A

Solution(By Apex Team)

The average of 4 boys and 3 girls on expenditure = ₹ 120 Total expenditure = 120 × 7 = Rs. 840 The average of 4 boys on expenditure = ₹ 150 Total expenditure of 4 boys = 150 × 4 = 600 Total expenditure of 3 girls = Total expenditure – Total expenditure of 4 boys Total expenditure of 3 girls = 840 – 600 = 240 ∴ Their average expenditure $\Large\frac{240}{3}$ = Rs. 80

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years