Math mainly about how to figure out what's left of something of one piece of info

Question

On Thursday, a local hamburger shop sold a combined total of 424

 hamburgers and cheeseburgers. The number of cheeseburgers sold was three times the number of hamburgers sold. How many hamburgers were sold on Thursday?

Answer 1

Let c be the number of cheeseburgers sold and h be the number of hamburgers sold

Given - Number of cheeseburgers sold is 3 times the number of hamburgers sold.

c= 3h

c +h = 424

Substitute c= 3h

3h +h = 424

4h = 424

h = 106

Number of hamburgers sold on Thursday = 106