Average
- In a team of 10 persons, nine persons spent ₹40 each for their meal and the remaining one spent ₹9 more than the average expenditure of all the 10 persons. The total expenditure for their meal was
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Let the amount spent by tenth person be Rs y,
According to the question,y – 40 × 9 + y = 9 10 ⇒ 10y - 360 - y = 9 10
⇒ 9y – 360 = 90
⇒ 9y = 360 + 90 = 450
⇒ y = 450 ÷ 9 = Rs. 50
Correct Option: C
Let the amount spent by tenth person be Rs y,
According to the question,y – 40 × 9 + y = 9 10 ⇒ 10y - 360 - y = 9 10
⇒ 9y – 360 = 90
⇒ 9y = 360 + 90 = 450
⇒ y = 450 ÷ 9 = Rs. 50
∴ Total expenditure = 40 × 9 + y = 360 + 50
Total expenditure = Rs. 410
- The average (arithmetic mean) of 330, 360 and 390 is
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As we know that ,
Arithmetic mean = Sum of given terms Total number of terms Arithmetic mean = 330 + 360 + 390 3
Correct Option: C
As we know that ,
Arithmetic mean = Sum of given terms Total number of terms Arithmetic mean = 330 + 360 + 390 3
Arithmetic mean = 329 + 359 + 389
- A man purchased 7 bags of rice at the rate of ₹800 each, 8 bags of rice at ₹1000 each and 5 bags of rice at the rate of ₹1200 each. What is the average cost of one bag of rice ?
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According to question ,
Average cost of 1 bag of rice = ₹ 7 × 800 + 8 × 1000 + 5 × 1200 7 + 8 + 5 Average cost of 1 bag of rice = ₹ 5600 + 8000 + 6000 20
Correct Option: B
According to question ,
Average cost of 1 bag of rice = ₹ 7 × 800 + 8 × 1000 + 5 × 1200 7 + 8 + 5 Average cost of 1 bag of rice = ₹ 5600 + 8000 + 6000 20 Average cost of 1 bag of rice = 19600 = ₹980 20
- A fruit seller sold big, medium and small sized apples for ₹15, ₹10 and ₹5 respectively. The total number of apples sold were in the ratio 3 : 2 : 5. Find the average cost of an apple.
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A fruit seller sold big, medium and small sized apples for ₹15, ₹10 and ₹5 .
The total number of apples sold were in the ratio 3 : 2 : 5.
Ratio of values = 15 × 3 : 10 × 2 : 5 × 5 = 45 : 20 : 25Correct Option: C
A fruit seller sold big, medium and small sized apples for ₹15, ₹10 and ₹5 .
The total number of apples sold were in the ratio 3 : 2 : 5.
Ratio of values = 15 × 3 : 10 × 2 : 5 × 5 = 45 : 20 : 25∴ Required average cost = 45 + 20 + 25 = 90 = ₹9 10 10
- Ram aims to score an average of 80 marks in quarterly and half yearly exams. But his average in quarterly is 3 marks less than his target and that in half yearly is 2 marks more than his aim. The difference between the total marks scored in both the exams is 25. Total marks aimed by Ram is :
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Let each exam be of 100 marks.
∴ Difference = 82 – 77 = 5
∵ 5 = 100 marks
∴ 25 = 500 marksCorrect Option: A
Let each exam be of 100 marks.
∴ Difference = 82 – 77 = 5
∵ 5 = 100 marks
∴ 25 = 500 marks∴ Required marks = 500 × 80 = 400 100