What should come in place of both the question marks in the equation ?128=162? 1

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Question
What should come in place of both the question marks in the equation ?128=162?
Options
A. 12
B. 14
C. 144
D. 196

Correct Answer

12

Explanation

Let $\frac{x}{\sqrt{128}} = \frac{\sqrt{162}}{x}$

Then, $x^{2} = \sqrt{128 � 162} = \sqrt{64 � 2 � 18 � 9} = \sqrt{(8^{2} � 6^{2} � 3^{2})} = 8 � 6 � 3 = 144$

$? x = 12$

Square Root and Cube Root problems

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1. If 18225=135 , then the value of 182.25 +1.8225+0.018225+0.00018225 is:
Options
A. 1.49985
B. 14.9985
C. 149.985
D. 1499.85

2. If (89)2 is added to the square of a number, the answer so obtained is 16202. What is the (1/26) of that number?
Options
A. 5.65
B. 2.7
C. 3.5
D. 6.66

5. A group of students decided to collect as many paise from each member of group as is the number of members. If the total collection amounts to Rs. 59.29, the number of the member is the group is:
Options
A. 57
B. 67
C. 77
D. 87

8. If 35+125=17.88 , then what will be the value of 80+65 =?
Options
A. 13.41
B. 20.46
C. 21.66
D. 22.35

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