How many ways are there to choose 3 fruits from 7 types of fruit?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Plz hurry evaluate the expression a+b where a=8 and b=19