4 boys and 3 girls spent 120 Rs. on the average, of which boys spent 150 Rs. on the average. Then what would be the average amount spent by the girls is :

[A]60 Rs.

[B]80 Rs.

[C]90 Rs.

[D]100 Rs.

**80 Rs.**

Total expenditure

Total expenditure of 4 boys

Total expenditure of 3 girls

∴ Their average expenditure

Hence option [B] is correct answer.