SSC CHSL 2021 · PYQ · Ratio and Proportion · medium
A, B, C and D are four positive numbers such that A is 3/4 times of B, B is 4/5 times of C, and C is 3/8 times of D. If the average of 4 times of A and 7 times of D is 316, then the average of all the four numbers A, B, C and D is:
A.36✓ Correct
B.34
C.28
D.38
Explanation
Let D = 80. Then C = 30, B = 24, A = 18. Average of 4A and 7D = (72 + 560)/2 = 316. ✓ Average of A,B,C,D = (18+24+30+80)/4 = 152/4 = 38. So answer is 38.
💡 Practice unlimited SSC CHSL PYQs + AI-tracked progress on each topic. Sign up free →