Answer:
The 4th option is the correct answer
It will take 19 hours of lesson
Explanation:
It is given that,
Ahmets rent a piano for $35 per month.
Also he earn $25 per hour giving piano lessons.
He wants to make profit $440 per month.
To calculate the hours needed for getting profit $440
Let x be the total hours spending for piano lesson
So he earn $25x in one month
But the expenditure is piano rent $35 per month.
Profit = 440
25x - 35 =440
25x = 475
x = 19
So it will take 19 hours of lesson