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RRB Assistant Loco Pilot and Technician Model Paper 6 with solutions
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© examsnet.com
Question : 13
Total: 75
Each edge of a cube is increased by 50%, the percentage increase in the surface area of the cube is:
50
100
125
200
Validate
Solution:
Suppose each edge of the cube be x, on increasing 50% of each edge,
New edge = x +
1
2
x
=
3
2
x
Original surface area of the cube =
6
l
2
=
6
x
2
New surface area of the cube
= 6
(
3
x
2
)
2
=
6
×
9
x
2
4
=
27
2
x
2
Increase in surface area
=
27
2
x
2
−
6
x
2
=
27
x
2
−
12
x
2
2
=
15
x
2
2
∴ % increase =
15
x
2
2
6
x
2
×
100
=
125
© examsnet.com
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