Set up equations and solve them to find the unknown numbers in the following cases: 

(a) Add 4 to eight times a number; you get 60. 

(b) One-fifth of a number minus 4 gives 3. 

(c) If I take three-fourths of a number and add 3 to it, I get 21. 

(d) When I subtracted 11 from twice a number, the result was 15. 

(e) Munna subtracts thrice the number of notebooks he has from 50, and he finds the result to be 8. 

(f) Ibenhal thinks of a number. If she adds 19 to it and divides the sum by 5, she will get 8. 

(g) Anwar thinks of a number. If he takes away 7 from 5/2 of the number, the result is 23.