GIVEN: Total number of boys and girls = 100 and Rs. 312 are distributed among the boys and girls such that each boy gets Rs. 3.60 and each girl gets Rs. 2.40 CALCULATION: Let the number of boys is x and the number of girls is (100−x) ⇒3.6x+(100−x)×2.4=312 ⇒3.6x+2.4×100−2.4x=312 ⇒1.2x+240=312 ⇒1.2x=312−240 ⇒1.2x=72 ⇒x=60 ∴ Number of girls (100−x) = (100 - 60) = 40