Zachary saved x nickels and y dimes last month. Lily saved x nickels and 2y dimes. Lily saved $2 more than Zachary and the total number of her dimes is 4 times the total number of her nickels.

Question

a) How many coins does Zach have?
b) How much did Lily save?
c) How much did Zachary save?

Needs to be modeled using Singapore Math!

Answer 1

a) 10 nickels; 20 dimes

b) $4.50 (10 nickels; 40 dimes)

c) $2.50

Answer 2

Eq1,Lily: 5*x + 10*2y = 5*x + 10*y + 200.
Replace 2y with 4x and y with 2x:
Lily: %*x + 10*4x + %5*x + 10*2x + 200.
5x + 40x = 5x + 20x + 200
X = 10 nickels.

In Eq1, replace X with 10 and solve for Y:
50 + 20y = 50 + 10y + 200
Y = 20 dimes.

a. 10 + 20 = 30 Coins.

b. 5x + 20y = 5*10 + 20*20 = 450 Cents = $4.50.

c. 5x + 10y = 5*10 + 10*20 = 250 Cents = $2.50.