Question

What is the value of a in the equation , when ? 3 15 21 39

Answer 1

Answer:

15

Step-by-step explanation:

5 times 15 is 75

10 times 3 is 30

75 -30 = 45

Answer 2

Answer:

The value of a is 15

Step-by-step 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

$5a-10(3)=45$

$5a-30=45$

$5a=45+30=75$

$a=\frac{75}{5}=15$

Hence, the value of a is 15