Lesson: Applied Arithmetic - 07t05

Ratios, continued

[Page 7 of 36]
Task Use the classic ratio setup to answer the following questions. Type each answer into the Text Box provided, and then click Continue.

At a Halloween party, there are 30 guests, 16 of whom are Draculas and 14 of whom are Mummies.

Hint

1.   What is the ratio of Draculas to Mummies at the party?

Answer: 8:7
2.   What is the ratio of Mummies to the total number of party guests?

Answer: 7:15
3.   Assuming no Mummies leave, how many Draculas need to arrive to make the ratio of Draculas to guests 2:3?

Answer: 12
Continue


 Look to the number that doesn't change, and use that with your new ratio. The number of Mummies remains the same at 14. You are told that you want , so you want 2 Draculas for every 1 Mummy, which means you want . Since , you want a total of 28 Draculas. There are presently 16 Draculas, so you want 12 more to arrive.
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