Question

In an exam, there were 25 math qns and 75 nonmath qns. To answer a math qn, a candidate was supposed to spend twice the time he spends to answer a nonmath qn. If the entire exam duration was 2 hrs, find the time he spent on the math qns.

Answer 1

Answer:

Totaltime=2hrs=l20 min

Time for non maths=xmin

maths=2xmin

25x2X+75x X=120

50 x+75x = 120

.125x=120

x = 120/125=24/25 min

Time for I mathsqn=24/25m

2... 48 /25m

2 maths qn=48/25

25. ... =25 /2 x 48/25=24 min

for answering 25 maths qn

24 minutes.