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Question 1 of 10

1. Question

1 points

Category: Quantitative Aptitude

A invested Rs 1600 in a bank offering x% at simple interest for 2 years and B invested Rs 2500 in a bank offering (x + 3) % at simple interest for 3 years. What is the value of x if total interest received by them is Rs 1509?

Correct

Answer- 5) 12
Explanation-
We have,
2x% of 1600 + 3(x + 3)% of 2500 = 1509
32x + (3x + 9) × 25 = 1509
32x + 75x + 225 = 1509
107x = 1284
x = 12

Incorrect

Answer- 5) 12
Explanation-
We have,
2x% of 1600 + 3(x + 3)% of 2500 = 1509
32x + (3x + 9) × 25 = 1509
32x + 75x + 225 = 1509
107x = 1284
x = 12

Question 2 of 10

2. Question

1 points

Category: Quantitative Aptitude

Directions (Q2-5). Find the wrong number in the following number series:

If Rs 880 is invested at x% on simple interest, it produces Rs 140.8 interest. How much Rs 1000 will amount to after 2 years if it is invested at (x + 3) % on compound interest?

Correct

Answer- 2) Rs 1232.1
Explanation-
We have,
140.8/880 × 100 = 16
Therefore, x = 16/2 = 8%
Rate of interest on the other amount = 8 + 3 = 11%
Effective rate of interest = 11 + 11 + 121/100 = 23.21%
Amount after 2 years = 1000 + 23.21% of 1000 = 1000 + 232.1 = Rs 1232.1

Incorrect

Answer- 2) Rs 1232.1
Explanation-
We have,
140.8/880 × 100 = 16
Therefore, x = 16/2 = 8%
Rate of interest on the other amount = 8 + 3 = 11%
Effective rate of interest = 11 + 11 + 121/100 = 23.21%
Amount after 2 years = 1000 + 23.21% of 1000 = 1000 + 232.1 = Rs 1232.1

Question 7 of 10

7. Question

1 points

Category: Quantitative Aptitude

A can do a piece of work in 20 days. He works for 4 days and the left the work. The rest of the work was done by B in 36 days. In how many days B alone can complete the whole work?

Correct

Answer- 1) 45 days
Explanation-
Work completed by A in 4 days = 4/20 = 1/5
Remaining work = 1 – 1/5 = 4/5
Time taken by B to complete the whole work alone = 36/4 × 5 = 45 days

Incorrect

Answer- 1) 45 days
Explanation-
Work completed by A in 4 days = 4/20 = 1/5
Remaining work = 1 – 1/5 = 4/5
Time taken by B to complete the whole work alone = 36/4 × 5 = 45 days

Question 8 of 10

8. Question

1 points

Category: Quantitative Aptitude

There are 15 students in a class and the average age of class in x years. If the age of teacher who age is 48 years included, the average age of the class will increase by 2 years. What is the value of x?

Correct

Answer- 5) 16
Explanation-
We have,
(15x + 48)/16 = x + 2
15x + 48 = 16x + 32
x = 16

Incorrect

Answer- 5) 16
Explanation-
We have,
(15x + 48)/16 = x + 2
15x + 48 = 16x + 32
x = 16

Question 9 of 10

9. Question

1 points

Category: Quantitative Aptitude

An article is sold at 40% discount and the profit earned is 20%. If the difference between selling price and marked price is Rs 540, what is the cost price of the article?

Correct

Answer- 3) Rs 675
Explanation-
Let the cost price of the article is Rs 100x.
Selling price of article = 120x
Marked price of article = 120x/60 × 100 = Rs 200x
We have,
(200x – 120x) = 540
80x = 540, x = 6.75
100x = Rs 675

Incorrect

Answer- 3) Rs 675
Explanation-
Let the cost price of the article is Rs 100x.
Selling price of article = 120x
Marked price of article = 120x/60 × 100 = Rs 200x
We have,
(200x – 120x) = 540
80x = 540, x = 6.75
100x = Rs 675

Question 10 of 10

10. Question

1 points

Category: Quantitative Aptitude

Ratio of milk and water in a container is 3:2 respectively. 5 l of the mixture is taken out and was replaced with 50 l of water due to which ratio of milk and water in the container becomes 23:32. What was the amount of milk in the container originally?

Correct

Answer- 4) 72 l
Explanation-
Let the amount of mixture after 5 l of mixture is taken out is 5x l.
Then, according to question,
3x/(2x + 50) = 23/32
96x = 46x + 1150
50x = 1150, x = 23
Amount of mixture originally = 5 × 23 + 5 = 120 l
Amount of milk originally = 120/5 × 3 = 72 l

Incorrect

Answer- 4) 72 l
Explanation-
Let the amount of mixture after 5 l of mixture is taken out is 5x l.
Then, according to question,
3x/(2x + 50) = 23/32
96x = 46x + 1150
50x = 1150, x = 23
Amount of mixture originally = 5 × 23 + 5 = 120 l
Amount of milk originally = 120/5 × 3 = 72 l

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