Question 33

The average of 29 consecutive even integers is 60. The highest of these integers is

Solution

The 29 consecutive even integers will form an arithmetic progression with common difference, $$d = 2$$

Let the first term be $$a$$

Average of 29 integers = 60, => Sum = $$29 \times 60 = 1740$$

=> Sum of these integers = $$\frac{n}{2}[2a+(n-1)d] = 1740$$

=> $$\frac{29}{2}[2a + (28 \times 2)] = 1740$$

=> $$29(a+28)=1740$$

=> $$(a+28)=\frac{1740}{29}=60$$

=> $$a=60-28 = 32$$

$$\therefore$$ The highest integer or the 29th term, $$A_{29} = a + (29-1)d$$

= $$32 + (28 \times 2) = 32 + 56 = 88$$

=> Ans - (A)


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