6.
The average weight of 5 boys sitting in a boat is 38 kg. If the average weight of the boat and the boys sitting in the boat is 52 kg. What is the weight of the boat?
- A.228 kg
- C.232 kg
- B.122 kg
- D.242 kg
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Average weight of 5 boys = 38 kg |
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| Now, average weight of ( the boat + 5 boys) = 52 kg | ||||||
| Total weight of ( the boat + 5 boys) = 52 x 6 = 312 kg | ||||||
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7.
It rained as much on Thursday as on all the others days of the week combined. If the average rainfall for the whole week was 3 cm, how much did it rain on Thursday?
- A.2.625 cm
- C.10.5 cm
- B.3 cm
- D.15 cm
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Let the rainfall on Thursday be x cm so that one the other 6 days, the total is also x. | ||||||
Since average rainfall for the week = 3 cm |
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8.
The average age of 8 men is increased by 2 years. When two of them, whose ages are 20 years and 24 years respectively, are replaced by two women, What is the average age of these women?
- A.36 years
- C.40 years
- B.30 years
- D.42 years
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Let the average age of 8 men be x years | ||||||||||
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| Now, according to the condition of the question, average age of (6 men + 2 women) | ||||||||||
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| Hence, it is clear that on replacing two men by two women, sum of their ages increased by 16 years | ||||||||||
| Therefore, sum of the ages of two women = (20 + 24) + 16 = 60 yrs. | ||||||||||
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9.
There are 35 girls in a School. If the number of girls increased by 7, the expenses of the lunch were increased by Rs 42 per day while the average expenditure per head diminished by Re. 1. Find the Original expenditure of the lunch.
- A.Rs. 480
- C.Rs. 520
- B.Rs. 440
- D.Rs. 420
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Let the original expenditure = Rs x | ||||||||||||||
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10.
The average weight of 24 soldiers of a company A of a battalion is 58 kg, whereas the average weight of 26 soldiers of a company B of the same battalion is 60.5 kg. Find the average weight of all the 50 soldiers of the battalion
[Note: A battalion consists of multiple companies, A company consists of multiple soldiers]
[Note: A battalion consists of multiple companies, A company consists of multiple soldiers]
- A.57.4 kg
- C.58.9 kg
- B.59.3 kg
- D.59.7 kg
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Average weight of 24 soldiers of company A = 58 kg |
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| Total weight of 24 soldiers of company A = 58 x 24 = 1392 kg | ||||||
| Average weight of 26 soldiers of company B = 60.5 kg | ||||||
| Total weight of 26 soldiers of company B = 60.5 x 26 = 1573 kg | ||||||
| Total weight of 50 soldiers = (1392 + 1573) kg = 2965 kg | ||||||
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