Question

Talent of a cuboid is one more than twice its breadth the perimeter of the base is 20 cm and the total surface area is 122 cm find the dimensions of the cuboid length of a cuboid is one more than twice its breadth the perimeter of the base is 20 cm and the total surface area is 122 cm find the dimension of the cuboid

Answer 1

Answer:

let the breadth be x

the length will be 2x+1

a/q

2(l+b)=20

l+b=10

3x+1=10

x=3

the length=7

122=2(21+3h+7h)

61=21+10h

40=10h

h=4

Answer 2

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l= b+1

2(l+b) =20

2(b+1+b) =20

2(2b+1) =20

4b+2=20

4b=18

b= 18/4

l=5.5cm

TSA= 2(lb+bh+hl) = 220

= 2[(5.5×4.5) +(4.5×h)+ (h×5.5)]=220

=2(247.5+10h) =220

= 45.50+10h= 220

= 10h=220

=17.5cm