Tom received $18 from his father in a week. The ratio of the amount of money he spends to the amount of money he saves in a week is 5:4.
(a) What is the difference between the amount of money spent and the amount of money saved in a week?
(b) How much does Tom save in a week?
+60 First, we have to turn 5:4 into two numbers that add to 18.
(Remember ratios are also fractions!)
We can multiply 5:4 by 2 to get 10:8!
10 + 8 = 18
Now that we have a working ratio let's answer the questions!
(a) All we have to do is subtract 10 and 8 because we need to figure out the difference!
(Fun Fact: Difference is another way of saying subtraction) 
10 minus 8 is 2 
(b) The ratio is the amount he spends to saves. This means he saves 8 (10:8) in a week! 
Answers:
(a) 2
(b) 8
Hope this helped!
+36 SirAkko, I really like your explanation! Not only did you tell why you did things, you also provided explanations to certain vocabulary in case the person asking the question didn't know, such as telling ratios are also fractions and difference is the same thing as subtraction. Thanks for some insight on how I should answer questions thoroughly and explain to others.
+36 Just making the ratio to the original thing.
5+4 = 9
18/9 = 2
10:8
a. 10-8 = 2 dollars
b. 8 dollars.
+36 SirAkko, I really like your explanation! Not only did you tell why you did things, you also provided explanations to certain vocabulary in case the person asking the question didn't know, such as telling ratios are also fractions and difference is the same thing as subtraction. Thanks for some insight on how I should answer questions thoroughly and explain to others.
