120 average questions with shortcut trick(part 2)

9) The average of four consecutive odd number A, B, C and D respectively is 24 what is the product of B and D?


10)The average of five consecutive even number starting with 8 is?


11)P ,Q, R and S are four consecutive even number respectively  and their average is 45. What  is the product of P and Q?


12)The age of four members of a family are in the year 2010 are x, x+12,x+24, x+36.After some year oldest  among them was dead then average reduced by 3. after how many years from his death, the average age will same as in 2010?


13)Find the average of  first 40 natural numbers?

Answer

Sum of 1st 40 natural numbers=40*41/2

                                                =820/40=20.5

14)Find the average of first  12 multiples of 12?



15)What will the average of first 20 multiples of  4?


16)If the sum of 11 consecutive odd number is       

      253 .find the first term?

      Answer is 13


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