Question

If 18, a, (b-3) are in A.P. then find the value of 20-b.​

Answer 1

Answer:

35 - 2a

Step-by-step explanation:

Given:- 18, a, (b-3) are in A.P.

then,

As the common difference is constant, we can write

a-18 = (b-3) - a

2a = b + 15

2a - b = 15

15 - 2a = -b

By adding 20 on both sides we get,

35 - 2a = 20 - b

So the answer is 35 - 2a