If a«b a = 18 when b = 3, then find a when b = 5

I need help asap

a = 30

Step-by-step explanation:

Given the following data;

a = 18

b = 3

This is a direct proportion question.

Therefore, a is directly proportional to b.

Mathematically, a = kb

First of all we would find the constant, k;

k = a/b

k = 18/3

k = 6

Now to find the value of a when b = 5

a = kb

a = 6*5

a = 30

b. astronomers