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The average of 10 men is decreased by 5 kg, when one of them weighing 100 kg is replaced by another person. The new person is again replaced by another person, whose weight is 10 kg lower than the person he replaced. What is overall change in the average due to this dual changes ?

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Important Questions on Average

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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 15
Find the average weight of four packets, if it is known that the weight of the first packet is 20 kgand the weights of the second, third and fourth packets' each is defined by f(x)=x2-25×x2 where x=10 .
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 16
There are five boxes in a box hold. The weight of the first box is 40 kg and the weight of the second box is 50% higher than the weight of the third box, whose weight is 25% higher than the first boxes' weight. The fourth box at 150 kg is 50% heavier than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 17
There are five boxes in a box hold. The weight of the first box is 40 kg and the weight of the second box is 50% higher than the weight of the third box, whose weight is 25% higher than the first boxes' weight. The fourth box at 150 kg is 50% heavier than the fifth box. Find the difference in the average weight of the heaviest three and the lightest three.
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 18
20 persons went to a hotel for a combined dinner party. 15 of them  spent ₹90 each on their dinner and rest spent ₹30 more than the average expenditure of all the 20. What was  the total money spent  ( in ₹ ) by them?
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 19
There were 30 students in a hostel. Due the admission of 20  new students, the expenses of the mess increases by ₹1600  per day while the average expenditure per head diminished by ₹8. What was the original expenditure (in ₹) of the mess?
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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 20

The average price of 3 precious diamond studded platinum thrones is ₹97610498312. If their prices are in the ratio 4:7:9. The price of the cheapest is

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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 21

The average weight of 23 boxes is 3 kg. If the weight of the container (in which the boxes are kept)is included, the calculated average weight per box increase by 1kg . What is the weight of container. 

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How to prepare for Quantitative Aptitude for the CAT>Chapter 5 - Average>Level of Difficulty>Q 22

A man covers 1/4th of his journey by cycle in 40km/h, the 1/2 of the remaining by car at 20km/h, and the rest by walking at 10km/h. Find his average speed during the whole journey.