On Friday, a local hamburger shop sold a combined total of 390 hamburgers and cheeseburgers. The number of cheeseburgers sold was two times the number of hamburgers sold. How many hamburgers were sold on Friday?

There were 130 hamburgers sold on Friday

Step-by-step explanation:

Assume that the number of hamburgers sold is x

∵ The number hamburgers sold = x

∵ The number of cheeseburgers sold was two times the number of

   hamburgers sold

∴ The number of cheeseburgers sold = 2x

∵ On Friday, the shop sold a combined total of 390 hamburgers and

    cheeseburgers

→ Add x and 2x, then equate the sum by 390

∴ x + 2x = 390

→ Add the like terms

∴ 3x = 390

→ Divide both sides by 3

∵ =

∴ x = 130

∵ x represents the number of hamburgers

∴ There were 130 hamburgers sold on Friday

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