Answer:
in 2 years
Step-by-step explanation:
If x is the number of years
then the number of students taking Spanish is 579 + 30x
and the number of students taking French is 217 - 2x
"There be three times as many students taking Spanish as taking French" means 3 times the number of students taking French equals the number of students taking Spanish
so 579 + 30x = 3(217 - 2x)
579 + 30x = 651 - 6x
36x = 72
x = 2
Hope this helps