Question

An exam of 145 marks contains 50 guestions .if some of the guestions are of two marks and some are of five marks then the numbers of two guestions is
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Answer 1

Step-by-step explanation:

Let there be X questions of 2 marks and y questions of 5 marks.

In that case X+y=50

Or 2x+2y= 100

Also total marks are 145.

So 2x+5y = 145

Subtracting the first equation from second we have

3y =45

Or y is 15.

X becomes 50-y or 35.

So 35 questions of 2 marks and 15 questions of 5 marks.