If 4a-b = 64 and 64a-b = 4 then find the value of a

ਇੰਤਕਾਮ ਸ਼ਬਦ ਦਾ ਅੰਗਰੇਜ਼ੀ ਅਨੁਵਾਦ ਹੈ

Post-office saving bank is a useful scheme for salaried persons.
ਉਪਰੋਕਤ ਵਾਕ ਦਾ ਪੰਜਾਬੀ ਅਨੁਵਾਦ ਹੈ

Nepotism ਸ਼ਬਦ ਦਾ ਪੰਜਾਬੀ ਅਨੁਵਾਦ ਹੈ

In the question given below, three statements are given, followed by three conclusions I, II and III. You have to accept the given statements as true even if they seem to be at odds with the commonly known facts. Read all the conclusions and decide which of them logically follows from the given statements, ignoring commonly known facts.
Statement
Some shapes are circles.
Some shapes are spheres.
No sphere is a triangle
I) Some shapes are not triangles
II) Some circles are not triangles
III) Some circles are spheres

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it seems to be at odds with commonly known facts, decide which of the given conclusions logically follow from the statements
Statement
All girls are birds.
Some birds are students.
Some students are girls.
Conclusion
I. All girls are students.
II. All birds are girls.
III. Some girls are students.

To complete the following alphabetic sequence, the question mark (?) should be replaced by
CYP EWR GUT ISV ?

Seven persons P, Q,R, S,T, U and are sitting in a straight row facing north. Only three persons sit between Q and T. Only one person sits to the left of Q. S sits fourth to the left of V. R sits second to the left of T. U sits exactly between R and T
Who sits third to the right of Q