Two arithmetic means are to be inserted between and such that the means are and

MATHEMATICS · Single correct · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

Two arithmetic means are to be inserted between

7

and

k

such that the means are

11

and

15

. What is the value of

k

? (a) 23 (b) 17 (c) 19 (d) 20