Question

Write consecutive odd numbers between 50 and 70

Answer 1

Consecutive odd numbers between 50 and 70 are:- 51,53,55,57,59,61,63,65,67,69.

Answer 2

Let us figure out Y first as it is easier. There are 21 integers between 50 and 70. Since first integer is even that means even integers are more than odd integers. 

Odd integers = 10

Even integers = 11

Hence Y = 10

To find sum of even integers we can find out the median/mean (both being same in this case as numbers are in arithmetic progression)

(50+70) / 2 = 60

60 x 11 (# of even terms)

X = 660

This X + Y = 660 + 10 = 670 (D)

Hope it helps.

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