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A tutoring program serves a total of 22 students who are either 15 or 16 years old. The sum of the students' ages is 343. How many 15-year-old students does the tutoring program serve?

Respuesta :

ajprescott02

Answer: 9


Step-by-step explanation:

If you let x be the amount of 15 year olds and y to be the amount of 16 year olds.


x+y=22 15x + 16y = 343

So

y= 22-x


15x + 16(22 - x) = 343


15x + 352 -16x = 343


-x = -9


So x = 9


Therefore 9 15 year olds are on the program

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