# math

i can type 19 words in 38 seconds
how many can i type in60 seconds?
A)25
B)30
C)40
D)50

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1. Set up a proportion, cross-multiply, and solve for x.

19/38 = x/60

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posted by Ms. Sue
2. Nope.

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posted by Ms. Sue
3. How did you get those answers? Please show your work so that I can see what you don't understand.

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posted by Ms. Sue
4. 19*38=722 i don't get it

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posted by makeeda
5. Thanks.

19/38 = x/60

Cross multiply means to multiply the first and last terms together. Then multiply the middle terms together.

1140 = 38x

Use simple algebra to find the value of x. The equation means what unknown number when multiplied by 38 equals 1140?

1140 divided by 38 = 30

If you're still confused, please study the proportions part of this site carefully.

http://www.homeschoolmath.net/teaching/proportions.php

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posted by Ms. Sue
6. so it b

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posted by makeeda
7. Yes, it's b.

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posted by Ms. Sue

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