1.

A rectangular pool 20 metres wide and 60 metres long is surrounded by a walkway ofunifonn width. If the total area of the walkway is 516 square metres, how wide, in metres, is the walkway?

Answer»

43
4.3
3
3.5

Solution :
Let width of WALKWAY be x meter
Then, `(20+2x)(60+2x)=516+1200`
`rArr 1200+120x+40x+4x^2=516+1200`
`rArr 4x^2+160x-216=0rArrx^2+40x-129=0`
`rArr x^2+43x-3x-129=0 rArrx=3, x=-43`
`:." Width of walkway =3 METERS "`


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