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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  2. Nope.

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  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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  4. 19*38=722 i don't get it

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  5. Thanks.

    Your proportion is:

    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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  6. so it b

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  7. Yes, it's b.

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