Dale spends 12 hours on the internet, 75% on messages and 25% on games.
To make this easier, we can just convert the percentages into fractions and then continue.
To turn a percentage into a fraction, take the percentage number and put it into the numeriator, and add 100 to the denominator.
75% = 75/100
25% = 25/100
Simplify!
75% = 75/100 = 3/4
25% = 25/100 = 1/4
So, now we know how to convert the percentages into a fraction. Now! We must use the fractions to find out how to find the time he uses to play games.
We know now that he spends 1/4 of his time working on games, and 3/4 of his 12 hours working on messages. However, we want to know how much 1/4 is. Divide 12 by the denominator, 4, and this will determine how long 1/4 is.
12 / 4 = 3
So, that means that of his 12 hours he spends on the internet, he spends 3 hours doing games.
Now, subtract the time he spends doing the games by the time he spends on the internet to find the time on he spends messaging.
12 - 3 = 9
Which means that:
9 = Hours Spent Doing Messaging
3 = Hours Spent Playing Games