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Question
The volume of a cuboid is 140 cm³. The areas of any two of its surfaces are 28 cm3 and 20 cm3. The sum of the lengths of all the edges of the cuboid is.
एक घनाभ का आयतन 140 घन सेमी है। इसकी किन्ही दो सतहों का क्षेत्रफल 28 वर्ग सेमी और 20 वर्ग सेमी है। घनाभ के सभी किनारों की लम्बाई का योग है।
A.
64 cm
B.
160 cm
C.
100 cm
D.
140 cm
Answer ( Option A)

64 cm

Solution

 Key Points :-
l x bxh = 140
I x b = 28   (7x4)
b x h = 20 (5x4)

LxH        4,5,7
7 x 4 = 28
S x 4 = Po
4 x 4 = 16
            64

 

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