2 years ago

If the first chapter of a certain book is 40 pages long and makes up 20% of the book, how many pages does the entire book have?

Mathematics

1 answer:

Setler [38]2 years ago

5 0

Answer:

200

Step-by-step explanation:

20% of a book = 40 pages

100% of a book = x pages

20/100 = 40/x Cross multiply

20x = 100*40 Combine the right

20x = 4000 Divide by 20

20x/20 = 4000/20 Do the division

x = 200 Answer

You might be interested in

The sum of two numbers is -18. If the first number is 10, which equation represents this situation, and what is the second numbe

ki77a [65]

Don’t know if there’s much of an equation for it, but I guess the best way to write it out is 10 + x = -18. Then, you would subtract the 10 from both sides in order to isolate the x. So then you’re left with x = -28. So -28 is your answer.

8 0

2 years ago

-13=r/9+8<br> what is r equal to?

AURORKA [14]

Answer: r=(-189)

first you subtract both sides by 8 and get -21=r/9

then you multiply 9 with each side and get -189 = r

you can check by rewriting the problem with -189 as r and solving the equation