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Average questions and answers

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Average questions and answers

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  1. AVERAGE AVERAGE QUESTIONS AND QUESTIONS AND ANSWERS ANSWERS

  2. 1) 20 pens and 55 pencils were purchased for  Rs.600.If the average price of a pencil was Rs.2 ,  find the average price of a pen ? Explanation: Since average price of a pencil = Rs. 2 Therefore Price of 55 pencils = Rs.110 ,  Price of  20 pens =600-110 = 490 average price of a pen = 490/20 =24.5  Ans: 24.5

  3. 2) A man walks 2500 metres in 40 minutes , 1000  metres in 30 minutes and 500 metres in 10 minutes.  Then what is the average speed for whole walking  distance ? Explanation: Average marks = (2500+1000+500) / (40+30+10) =  4000 / 80 = 50 Ans : 50

  4. 3) Anil travels to a place 200 km away at an average 3) Anil travels to a place 200 km away at an average  speed of 70 km/hr and returns at 32 km/hr. Find the  average speed for whole journey in km/hr ? Explanation: Average speed = 2xy/ x+y . Average speed of given problem = (2*70*32) / 70+32 (140 *32) /102 = 4480/102  = 43.92 Average speed of given problem  =43.92. Ans: 43.92.

  5. 4) Find the  average of cubes of consecutive 10 natural 4) Find the  average of cubes of consecutive 10 natural  numbers ? Explanation: 10(10+1)² / 4 = (110)²/4 = 12100 /4 = 3025   Average of cubes of consecutive n natural numbers=  n(n+1)² / 4. Ans: 3025

  6. 5) Find the arithmetic mean of  3 , 5 , 7 , 8 , 13 , 17 ,22 5) Find the arithmetic mean of  3 , 5 , 7 , 8 , 13 , 17 ,22   and  x. Mean is 10 ,what should be the number in  place of x ? Explanation: Mean or average = (3+5+7+8+13+17+22+x) / 8 =10  -- --->  (75 +x) /8 =10   -------> x = 80 -75 = 5. Ans: 5

  7. 6) Find the average of all the numbers between 5 to 25 6) Find the average of all the numbers between 5 to 25  , which are divisible by 3 ? Explanation: Average = ( 6+9+12+15+18+21+24) / 7 = 105 / 7 =15. Ans: 15

  8. 7) Find the average of consecutive 25 natural numbers 7) Find the average of consecutive 25 natural numbers  ? Explanation : (25+1) / 2 = 26/2 = 13 Average of consecutive n natural numbers = (n+1)/2 Ans: 13

  9. 8) Find the average of consecutive even  numbers to 8) Find the average of consecutive even  numbers to  80 ? Explanation : Average = ((N/2)+1)                =(80/2)+1 = 40+1 = 41. Ans : 41

  10. 9) Find the average of consecutive natural numbers  from 20 to 80 ? Explanation : Average = (1st number + last number) / 2. So Average of given numbers = (20+80) / 2  =100/2  =50. Ans : 50

  11. 10) Find the Average of first  50 naturals numbers ?10) Find the Average of first  50 naturals numbers ? Explanation : Sum of first n natural numbers = n(n+1)/2. So  (50*51)/2 =1275 ,   There fore Required average =  1275/50 = 25.5 Ans: 25.5

  12. • For more details go through the website • http://www.mydearstudent.com/aptitude

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