Hello, jumpman23!

Paul has twice as many brothers as sisters.

His sister Mary has five times as many brothers as sisters.

How many sons and daughters do their parents have?

Let B = number of boys.

Let G = number of girls.

Paul has B-1 brothers and G sisters.

. . We are told that: .B - 1 .= .2G

Mary has B brothers and G-1 sisters.

. . We are told that: .B .= .5(G - 1)

Solve the system of equations: .B = 5, S = 2

Answer: .5 sons, 2 daughters