Question

the surface area of cuboid is 1372 square cm. if its dimension are in the ratio of 4:2:1. then find its length

Answer 1

2(lb+bh+hl) = 1372
(8x²+2x²+4x²) = 686
14x² = 686
x² = 49
x = 7
length = 4x
           = 4×7
           = 28