Question 153236
200=[(200/x)+1.50](x-30)
200=[(200+1.5x)/x](x-30)
200x=(200+1.5x)(x-30)
200x=200x+1.5x^2-6,000-45x
1.5x^2-45x-6,000=0
(1.5x-120)(x+50)=0
1.5x-120=0
1.5x=120
x=120/1.5
x=80 is the number of watermellons bought.
Proof:
200=[(200/80)+1.5](80-30)
200=[2.5+1.5]*50
200=4*50
200=200