Question

There are 200 questions on a 3 hour examination. Among 200 questions, 50 are Science. He spent twice, as much time on each Mathematics questions as for each other question. How many minutes did he spend on Mathematics questions?

Answer 1

Answer:

let the time taken for one question be x

then math question takes 2x

remaining questions otherthan math questions are 150

thentime taken for the remaining questions is 150x

time taken to solve math questions =50*2x=100x

100x+150x=10800s(3hr)

250x=10800s

x=250/10800=43.2

then time taken for math problems =43.2*50=2160s*2=4320s(72m)

Hope this will help you