Question

What is the value of a in the equation , when ?

3
15
21
39

Answer 1

15

Explanation:

5 times 15 is 75

10 times 3 is 30

75 -30 = 45

Answer 2

The value of a is 15

Explanation:

Given the equation

`5a-10b=45`

we have to find the value of a when b is 3

`5a-10b=45`

Substitute b=3, we get

`5a-10(3)=45`

`5a-30=45`

`5a=45+30=75`

`a=(75)/(5)=15`

Hence, the value of a is 15