Marc spent 1/3, 2/6 and 10 minutes in class. what was the total time in class?

Question

Trying to figure out how to solve this problem. The steps more importantly. Marc spent 1/3 of his time doing algebra, 2/6 of his time doing english, and the last 10 minutes reading a  book. How much time did Marc spend in class?

 

Another word problem is John spent 1/4 of his money of toys, 1/8 on food and had @25 dollars left. How much money did John have total before he spent anything.

Answer 1

Marc spent 1/3 of the time doing Algebra, another 1/3 (which is the same as 2/6) doing English, and the rest (which is also 1/3) reading a book. So if the last 1/3 was 10 minutes, that means that he was in class for 30 minutes.

The 2nd example, the answer is 40. He has now 25, he spend 25% (that's 1/4) of what he had, and also 12.5% (that'a an 1/8) of what he had. 1/4 = 2/8. So 2/8 + 1/8 = 3/8. So he's left now with 5/8 of what he had. If 5/8 = 25, then 8/8 = 40.