Question 220420
b / g = 5 / 3


"cross" multiplying ___ 3b = 5g ___ 6b = 10g


b / (g+3) = 10 / 7


7b = 10g + 30


substituting ___ 7b = 6b + 30 ___ b = 30


substituting ___ 3(30) = 5g ___ 90 = 5g ___ 18 = g


original class is 48 (30 + 18) ___ new class is 51 (48 + 3)