Maddie has 3 times as much money as Tom. Tom has half of what Lucy has.

Question

Lucy has 7 times as much as Billy. Billy has $1.50. How much money do they have altogether?

Answer 1

m = 3 t
t = L/2
L = 7 b = 7 * 1.50 = 10.5
so
t = 10.5/2 =5.25
m = 3 * 5.25 = 15.75
so in all 15.75 + 5.25 + 10.5 + 1.50

Answer 2

L = 7 * 1.50 = 10.50

T = 10.50/2 = ?

M = 3T

B = 1.50

Add them up.