Work through it
Six pencils cost $3. What's the cost of one?
, so one costs $0.50.
Solve .
5 times 4 is 20.
Watch out for this
The ratio 2:3 means 2 out of 3.
It means 2 parts for every 3 parts, or 5 parts in total. So the first group is of the whole.
Your turn
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