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dlinn [17]
3 years ago
10

8) Jennifer has a collection of 1,600 coins. Of the coins, 40% are dated

Mathematics
1 answer:
Kitty [74]3 years ago
4 0
<h3>Answer:  400  (choice A)</h3>

==============================================

Explanation:

40% + 35% = 75% of the coins were either made before 1940, or made from 1940 to 1980. In other words, 75% of the coins were minted before 1980. This leaves 100% - 75% = 25% of the coins to being minted after 1980.

25% of 1600 = 0.25*1600 = 400 coins were made after 1980

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The ratio of students to teachers at a school is 19 to 1 how many students are there in each total number of people
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<u>Question</u>:

The ratio of students to teachers at a school is 19 : 1. How many students are there in each total number of people?

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<u><em>A: 100 people</em></u>

Ratio  =  19  :  1

The sum of the ratio is 19 + 1 = 20

Scale factor  = \frac{100}{20}

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Ratio  =  19  :  1

The sum of the ratio is 19 + 1 = 20

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scale factor  = 14

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Ratio  =  19  :  1

The sum of the ratio is 19 + 1 = 20

Scale factor  = \frac{440}{20}

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The number of teachers is 1 \times 22 =  22

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The sum of the ratio is 19 + 1 = 20

Scale factor  = \frac{760}{20}

scale factor  = 38

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The number of teachers is 1 \times 38 =  38

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