Question

the floor of a rectangular hall has a perimeter 250 if the cost of painting the wall at the rate 10 per metre square is 15 and that find the height of hall

Answer 1

you made a mistake there is rupees 15000


area of four walls=cost of painting four walls/cost of painting 1m square

15000/10=1500msquare
perimeter of hall=2(l+b)=250
area of four walls =lateral surface area
so 2(l+b)×h=1500
2(l+b)=250
250×h=1500
h=1500/250
h=6 ans

if it is not your mistake then u can use 15 instead of 15000

Answer 2

hope it's helpful for u......