Question

WRITE AN EQUATION FOR EACH OF THESE AND SOLVE IT TO FIND THE VALUE OF THE UNKNOWN NUMBER:

a) I think of a number, I multiply it by 5 then add 5. The answer is 20

b) I think of a number, I divide it by 5 then subtract 5. The answer is 4

Answer 1

a)

Let the number we think be x.

Then,

According To The Question

=( x × 5 ) + 5 = 20
= x × 5 = 15
= x = 15/5 = 3


b)

Let the number we think be x.

Then,

According To The Question

=( x/5 ) - 5 = 4
= x/5 =9
= x = 9 × 5 = 45

HOPE THIS WILL HELP YOU

Answer 2

a) a *5+5= 20

5a + 5 = 20

5a = 20 - 5

5a = 15

a = 15/5

a = 3

b) b/5 - 5 = 4

b/5 = 4 + 5

b/5 = 9

b =9*5

b = 45