Four milkmen, A, B, C and D rented a pasture. A grazed 24 cows for 3 months; B grazed 10 cows for 5 months; C grazed 35 cows for 4 months; D grazed 21 cows for 3 months. If A's share of rent is Rs. 720, find the total rent of the field
A. Rs. 3,000
B. Rs. 3,200
C. Rs. 3,250
D. Rs. 3,300
Answer: Option C

A =24*3=72
B= 10*5=50
C =35*4=140
D= 21*3=63
TOTAL=72+50+140+63=325
A's Share of rent = 720
A's share in cow -month = 72
so, let total rent = x
72/325*x=720
72/325 *x *325 = 720*325
720*325/72 = x
3250=x