Jen baked strawberry, durian and coffee shortbreads. There were one-quarter as many coffee shortbreads as durian shortbreads and an equal number of coffee shortbreads as strawberry shortbreads. The cost of each shortbread is given as shown.

1 coffee shortbread: $1.70
1 durian shortbread: $1.20
1 strawberry shortbread: $1.50

If she collected $272 from selling all the shortbreads, how many durian shortbreads were there?

	Coffee	Durian	Strawberry
Ratio of shortbreads	1 u	4 u	1 u
Cost of 1 shortbreads	$1.70	$1.20	$1.50
Total Value	1.7 u	4.8 u	1.5 u

Coffee shortbreads : Durian shortbreads : Strawberry shortbreads
1 : 4 : 1

Total amount earned from selling all the shortbreads
= 1.7 u + 4.8 u + 1.5 u
= 8 u

8 u = 272
1 u = 272 ÷ 8 = 34

Number of durian shortbreads
= 4 u
= 4 x 34
= 136

Answer(s): 136