Russ P. answered • 01/04/15

Patient MIT Grad For Math and Science Tutoring

Jose,

Let Ny = total number of kids in year y (1, 2).

By = number of boys in year y.

Gy = number of girls in year y.

Then Ny = By + Gy for y=1 and y=2

N1 = 44 (B1 = 24 and G1 = 20)

Now in year 2, B2 = B1 plus 25% increase = 1.25 B1 = 1.25 (24) = 30

, G2 = G1 minus 10% decrease = 0.90 G1 = 0.90 (20) = 18

And N2 = B2 + G2 = 30 + 18 = 48.

Answers:

(a) N2 = 48 is bigger than N1 at 44, so there was an increase of 4.

(b) N2/N1 = 48/44 = 1.09 , there was a 9% increase in membership. Also could have computed 4/44 for the increase.