2 math problems need help!! [easy 10 pnts]

Question

in how many different ways can the letters of the word "WINDOW" be arranged?

choices: 720, 360, 180, 90, 45

if 40 percent of a 20 gallon solution is alcohol how many Quarts of water must be added to make a new solution which is 25 percent alchol?

choices: 60, 48, 36, 24, 12

it would help if sum1 explained them to me.

thnxs in advance =]

Answer 1

For the first one you have to have a scientific calculator and you just put in 6 (number of letters) and the ! key, and the answer is 720.

For the second, there's four quarts in a gallon so you currently have 80 quarts of solution, 32 quarts of which is alcohol. 32 is 25 percent of 128 so you have to add enough water to make 128 quarts of solution. The answer is 48 quarts.

Answer 2

1  you just do a factorial

and since there 6 letters you do

6!

which is 6x5x4x3x2x1

which equals 720

#2   ok so just think

25% is one quarter

and 40% of 20 is 8

so what is 8 a quarter of?

32

what do you add to 20 to get 32?

12

12 is your answer