Question

There are three fractions A, B and C. If A = 1/5 and
1/8 and the average of A, B and C is 1/10. What
is the value of C?
(a) -1/20
(b) - 1/60
(c) -1/30
(d) - 1/40​

Answer 1

Answer:

option d is correct

Step-by-step explanation:

(A+B+C)/3 =1/10

A+B+C =3/10

1/5+1/8+C =3/10

13/40+C =3/10

C=-1/40

Answer 2

A = 1/5 and B = 1/8

Average of A,B and C is 1/10

A + B + C = 3 × 1/10

1/5 + 1/8 + C = 3/10

1×8/5×8 + 1×5/8×5 + C = 3/10

8/40 + 5/40 + C = 3/10

13/40 + C = 3/10

C = 3/10 - 13/40

C = 3×4/10×4 - 13/40

C = 12/40 - 13/40

C = -1/40