Answer:
- 9 : 3 hours
- 800 : 1200 balloons
- 4 : 10 cupcakes
Explanation:
In some math curricula, you are shown how to work problems like this by drawing a picture. The picture of the first problem would look like a figure 12 units long, with another figure under it showing 3+1 = 4 equal parts. Each of those equal parts represents one of the units of the ratio and also represents 12/4 = 3 hours. Then 3 parts is 9 hours and the required division is ...
9 hours : 3 hours
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I like to phrase this in terms of "ratio unis." 4+6 = 10 ratio units in the second problem, so each one stands for 2000/10 = 200 balloons. That means 4 ratio units will be 800 balloons. The required division is ...
800 balloons : 1200 balloons
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Each of the 2+5=7 ratio units stands for 14/7 = 2 cupcakes. The required division is ...
4 cupcakes : 10 cupcakes