Question

3a+5b=10 and 5a +3b =30 then find average of a and b

Answer 1

3a + 5b = 10
5a + 3b = 30

Adding both the equations

8a+ 8b = 40
8(a + b) = 40
a + b = 5

so average of a+b = a+b/2 = 5/2 = 2.5