i can type 19 words in 38 seconds how many can i type in60 seconds?

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

19/38 = x/60

Nope.

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

19*38=722 i don't get it

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

so it b

Yes, it's b.