Question

Some students of a school planned a picnic. The budget was 500. But 50 of them failed to come and thus the cost of the food fir each student increased by 5. Find the number of student

Answer 1

you can solve it using set theory

Answer 2

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By direction options,  

500/25 = 20, 500/20 = 25

By mathematical method, the main steps are :

xy=500          ...(i)

and (x−5)(y+5)=500

⇒x−y=5 or y=x−5

Puting in equation (i)

x(x−5)=500

⇒x^2−5x−500=0

⇒x=25 and attended =x−5=20