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
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you can solve it using set theory
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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
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