Yes there are 8 flute players
The equation is
4+F=12
Subtract 4 from both sides you have F=8
24000 + 3000x = 30000 + 2400x
3000x - 2400x = 30,000 - 24,000
600x = 6000
x = 6000/600
x = 10 years
22, i think because 3 times 3= 9, and 9 times 3 minus 5= 22
