Question

the surface area of cuboid 15cm broad and 10 cm high is 1300cm find its length

Answer 1

Answer: 20 cm

Step-by-step explanation:

Breadth, b = 15 cm

Height, h = 10 cm

Length, l = ?

Surface area of cuboid = 1300 cm²

Surface area of cuboid = 2(lb + bh + lh)

1300 = 2((15×l) + (15×10) + (10×l))

1300 = 2(15l + 150 + 10l)

650 = 150 + 25l

25l = 650 - 150

25l = 500

l = 500/25

l = 20 cm

Therefore, length of the cuboid = 20 cm

Answer 2

1300= 2(l×15+15×10+l×10)
=2(25l+150)
1300 =50l+300
50l=1000
l=1000/50
l=20