Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q21. | Each edge of a cube is increased by 20%. What is the percentage increase in its surface area ? |
| 1) | 40 % | 2) | 44 % |
| 3) | 50 % | 4) | 25 % |
| 5) | None of these | ||
Answer : 44 %
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Q22. |
|
| 1) | 344.35 cm2 | 2) | 384.55 cm2 |
| 3) | 462 cm2 | 4) | 498.35 cm2 |
| 5) | None of these | ||
Answer : 498.35 cm2
Explanation :
Explanation :
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Q23. |
|
| 1) | 90 cm | 2) | 100 cm |
| 3) | 1 m | 4) | 1.1 cm |
| 5) | None of these | ||
Answer : 100 cm
Explanation :
Explanation :
Let the thickness of the bottom be x cm.
Then, [(330 - 10) x (260 - 10) x (110 - x)] = 8000 x 1000
or 320 x 250 x (110 - x) = (8000 x 1000)
(110 - x) = (8000 x 1000)/(320 x 250) or x = 100
So, x = 100 cm .
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