Basic Simplification Quiz Set 009

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Question 1

What is 488 × 99?

 A

48312.

 B

48321.

 C

48303.

 D

48330.

Soln.
Ans: a

This is a multiplication by a number that contains 9 only. Proceed like this: 488 × 99 = 488 × (100 - 1) = 488 × 100 - 488 = 48800 - 488 = 48312.


Question 2

What is 532 × 25?

 A

13300.

 B

13305.

 C

13295.

 D

13310.

Soln.
Ans: a

This is a multiplication by a power of 5. The best way is to observe that 25 = 52. There are 2 powers of 5. So append 2 zeroes and divide by 22, like this: $53200/4$ = 13300.


Question 3

Mr. X and Mr. Y have certain number of marbles with them. If Mr. X gives 3 marbles to Mr. Y, they will have the same number of marbles. But, if Mr. Y gives 4 marbles to Mr. X, then Mr. X will have twice as many marbles as are left with Mr. Y. How many marbles does Y have?

 A

18.

 B

20.

 C

16.

 D

22.

Soln.
Ans: a

Let them have X and Y marbles, respectively. We have X - 3 = Y + 3, which gives X - Y = 6. By the second condition, X + 4 = 2(Y - 4), which can be re-arranged to X - 2Y = -12. Solving for Y, we get Y = 18.


Question 4

A salesman is on a tour and has Rs. 300 for his expenses. If he exceeds his tour by 5 days, then he has to cut down his daily expenses by Rs. 10. What is the duration of his tour?

 A

10 days.

 B

12 days.

 C

8 days.

 D

14 days.

Soln.
Ans: a

Let the duration be x days. We have $300/x$ - $300/{x + 5}$ = 10. This equation can now be solved, or you can try substituting the options one by one, to obtain x = 10 days.


Question 5

What is 335 × 9999?

 A

3349665.

 B

3349674.

 C

3349656.

 D

3349683.

Soln.
Ans: a

This is a multiplication by a number that contains 9 only. Proceed like this: 335 × 9999 = 335 × (10000 - 1) = 335 × 10000 - 335 = 3350000 - 335 = 3349665.


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This Blog Post/Article "Basic Simplification Quiz Set 009" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2019-08-18.

Posted by Parveen(Hoven),
Aptitude Trainer


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