Question

In a 3-hr examination of 320 questions, there are 40 mathematics problems. if twice as much time should be allowed for each mathematics problems as for each of the other questions, how many minutes should be spent on mathematics problems?

Answer 1

1 minute should be spent on each math problem

Explanation:

Total questions = 320

Mathematics problems = 40

Non-mathematics problem = 320 - 40 = 280

Twice the amount of time is needed for mathematics problem.

40 x 2x + 280 x = 3 hours

80x + 280x = 3 hours

360x = 180 mins

x = 0.5 mins

2x = 0.5 x 2 = 1 min

Answer 2

Total questions = 320
Total mathematics problems = 40
Total non-mathematics problem = 320 - 40 = 280

Twice the amount of time is needed for mathematics problem.
40 x 2x + 280 x = 3 hours
80x + 280x = 3 hours
360x = 180 mins
x = 0.5 mins
2x = 0.5 x 2 = 1 min

Answer: 1 min should be spent on Mathematics problems