Question

Kim, Beth, and Jenny gave money to buy their mother a birthday gift.

Answer 1

Kim gave 40 x .35 = $14
Beth gave 40 x (3/8) = $15

Answer 2

Jenny --  x

.35*40 + (3/8)*40 + x = 40
14 + 15 + x = 40
29 + x = 40

x = 11