Instructions

For the following questions answer them individually

Question 21

How many kgs of tea worth Rs. 25 per kg must be blended with 30 kgs of tea worth Rs. 30 per kg so that by selling the blended variety at Rs. 30 per kg there should be a gain of 10%?

Question 22

In an examination, out of 480 students 85% of the girls and 70% of the boys passed. How many boys appeared in the examination if total pass percentage was 75%?

Question 23

300 gms of salt solution has 40% salt in it. How much salt should be added to make it 50% in the solution?

Question 26

A five-digit number divisible by 3 is to be formed using numerical 0, 1, 2, 3, 4 and 5 without repetition. The total number of ways this can be done is:

Question 27

A contract is to be completed in 50 days and 105 men were set to work, each working 8 hours a day. After 25 days, $$\frac{2}{5}th$$ of the work is finished. How many additional men be employed so that the work may be completed on time, each man now working 9 hours a day?

Question 28

A can built up a structure in 8 days and B can break it in 3 days. A has worked for 4 days and then B joined to work with A for another 2 days only. In how many days will A alone build up the remaining part of the structure?

Question 29

The first two terms of a geometric progression add up to 12. The sum of the third and the fourth terms is 48. If the terms of the geometric progression are alternately positive and negative, then the first term is

Question 30

The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80. Then which one of the following gives possible values of a and b?

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