Question

the length of a cuboid is 2 times its breadth if its height and lateral surface area 10 cm and 600 cm square

Answer 1

breadth =x
length=2x
height=10cm
LSA=600cm^2
but LSA of cuboid=2h(l+b)
i.e. 2h(l+b)=600
2×10(2x+x)=600
20×3x=600
60x=600
x=10cm
b=10cm
length =2×10=20cm

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