A sum of Rs.312 was divided among 100 boys and girls in such a way that the boy gets Rs.3.60 and each girl Rs. 2.40 the number of girls is  Choose one
A) 35
B) 40
C) 45
D) 50
E) 55
Explanation:   Step (i): Let x be the number of boys and y be the number of girls.   Given total number of boys and girls = 100   x+y=100 -------------- (i)   Step (ii): A boy gets Rs. 3.60 and a girl gets Rs. 2.40   The amount given to 100 boys and girls = Rs. 312   3.60x + 2.40y = 312 -------------- (ii)   Step (iii):   Solving (i) and (ii)   3.60x + 3.60y = 360 --------- Multiply (i) by 3.60   3.60x + 2.40y = 312 --------- (ii)   1.20y = 48   y = 48 / 1.20= 
<gadget id="calculator">48 / 1.20</gadget>
<output>40</output>
40   Number of girls= 40   Answer: 40
<result>B</result>
A sum of Rs.312 was divided among 100 boys and girls in such a way that the boy gets Rs.3.60 and each girl Rs. 2.40 the number of girls is