Question

some students planned a picnic the budget for the picnic was rupees 500 but 5 of this way to go and does the cost of the food for each member increased after how many students attend the picnic

Answer 1

500 by 5 =100
500 by 100=5
answer =5 .

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