Question

2. The average of three numbers is 6. If the
average of first two numbers is 4, what will
be the third number?
1. 10 2. 12 3. 13 4. 11
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Answer 1

Step-by-step explanation:

Let three numbers be a,b,c

Let three numbers be a,b,c a+b+c = 6

Let three numbers be a,b,c a+b+c = 6 3

Let three numbers be a,b,c a+b+c = 6 3 a+b+c = 18 (1)

(1)average of two number is 4

verage of two number is 4 a+b = 4

verage of two number is 4 a+b = 4 2

verage of two number is 4 a+b = 4 2 a+b = 8. (2)

(2) now,

(2) now,putting (2) and (1) we get

a+b+c = 18

a+b+c = 18 8 + c = 18

a+b+c = 18 8 + c = 18 c = 10

a+b+c = 18 8 + c = 18 c = 10Hence the third number is 10

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