Question
Gwen baked banana, durian and mocca biscuits. There were one-quarter as many mocca biscuits as durian biscuits and an equal number of mocca biscuits as banana biscuits. The cost of each biscuit is given as shown.

1 mocca biscuit: $1.50
1 durian biscuit: $1.60
1 banana biscuit: $1.10

If she collected $180 from selling all the biscuits, how many durian biscuits were there?
3 m

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Gwen baked banana, durian and mocca biscuits. There were one-quarter as many mocca biscuits as durian biscuits and an equal number of mocca biscuits as banana biscuits. The cost of each biscuit is given as shown.

1 mocca biscuit: $1.50
1 durian biscuit: $1.60
1 banana biscuit: $1.10

If she collected $180 from selling all the biscuits, how many durian biscuits were there?