50) Father's age 7 years before was one more than 3 times of his son's age. Father's age after 10 years will be 2 less than 2 times son's age. What is son's present age?

Answer is:

21

P-2, Q-3, R-4, S-1

P-2, Q-1, R-4, S-3

P-2, Q-4, R-3, S-1

P-3, Q-4, R-2, S-1

Answer is:

Class of chip breaker

Clearance angle

Basic shape

Tolerance class

Answer is:

Shot peening

Fullering

Bucking

Hammering

Answer is:

1.6

0.8

3.2

2.3

Answer is: