# 1.   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, 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.

Let the number in each case be n.

(a)  According to question:

or

or

(b) We have :

or

or

(c)  The equation is :

or

or

(d)  We have :

or

or

(e)  The equation is :

or

or

(f)  We have :

or

or

(g) We have :

or

or

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