Question 31 : A college has raised 75% of the amount it needs for a new building by receiving an average donation of Rs. 600 from the people already solicited. The people already solicited represent 60% of the people, the college will ask for donations. If the college is to raise exactly the amount needed for the new building, what should be the average donation from the remaining people be solicited?
1. 300
2. 250
3. 400
4. 500
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Question 32 : A number x is mistakenly divided by 10 instead of being multiplied by 10. what is the percentage error in the result?
1. -99%
2. -100%
3. 99%
4. 100%
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Question 33 : 80% of a smaller number is 4 less than 40% of a larger number. The larger number is 85 greater than the smaller one. The sum of these two number is
1. 325
2. 425
3. 235
4. 500
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Question 34 : An alloy contains the copper and aluminum in the ratio of 7:4. While making the weapons from this alloy, 12% of the alloy got destroyed. If there is 12 kg of aluminum in the weapon, then weight of the alloy required is :
1. 14.4 kg
2. 37.5 kg
3. 40 kg
4. 48 kg
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Question 35 : 600 students took the test on Physics and chemistry. 35% students failed in Physics and 45% students failed in chemistry and 40% of those who passed in chemistry also passed in Physics, then how many students failed in both :
1. 16
2. 15
3. 13
4. 12
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Question 36 : 220% of a number X is 44. What is 44% of X.
1. 8.8
2. 8.9
3. 6.6
4. 7.7
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Question 37 : The cost of packaging of the mangoes is 40% the cost of fresh mangoes themselves. The cost of mangoes increased by 30% but the cost of packaging decreased by 50%, then the percentage change of the cost of packed mangoes, if the cost of packed mangoes is equal to the sum of the cost of fresh mangoes and cost of packaging :
1. 14.17%
2. 7.14%
3. 8.87%
4. 6.66%
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Question 38 : The actual area of a rectangle is 60 Cm², but while measuring its length a student decreases it by 20% and the breadth increases by 25%. The percentage error in area, calculated by the student is :
1. 5%
2. 15%
3. 20%
4. No change
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Question 39 : In an office in Singapore there are 60% female employees. 50 % of all the male employees are computer literate. If there are total 62% employees computer literate out of total 1600 employees, then the no. of female employees who are computer literate ?
1. 690
2. 674
3. 672
4. 960
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Question 40 : (X% of Y) +(Y% of X) is equal to:
1. X% of Y
2. 20% of XY
3. 2% of XY
4. 2% of 100 XY
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