A square room of side 56dm is to be carpeted with a carpet of 70 cm width. Find the length of the carpet.
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answer:
given:
square room of side = 56dm
width of the carpet = 70cm
to find:
length = ?
proof:
( 1 dm = 10 cm)
( 56 dm = 56*10 = 560 cm)
perimeter = L * B
560 cm = L + B +L + B
560 = 2L + 2B
560 = 2L + 2*70
560 = 2L + 140
2 L = 560 - 140
2L = 420
L = 420 / 2
L = 210 cm
L = 21 dm
hence proved
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