Aptitude - Profit and Loss - Discussion

Let,

Each Ball cost of price x.
We know,
Cost price - selling price = loss.

17x- 720= 5x,
Or, 17x - 5x= 720,
Or, 12x= 720,
Or, x=720 ÷ 12.
0r, x=60,
So, x=tk 60 cost of each ball.

Thanks alot @Manasa.

Thanks @Manasa.

Thank you all for explaining properly.

17(cp-720) = 5cp,
cp = 60.

Let cp for 1 ball = x rs.
sp for 1 ball =720/17 rs.

***please note***(for 17 balls, loss = 5x therefore loss behind 1 ball = 5x/17)
Now, loss over 1 ball = c.p. over 1 ball - sp over 1 ball.
5x/17 = x - 720/17,
x = 60.

let CP of a ball x.
loss= CP - SP.
5x= 17x - 720,
x=60.

Your method is easy to understand, thanks @Hema.

Well said @Akshay.

Guys!
Check the question, how much did they sell 17 balls for?? Rs.720? Correct.

So now you know how much 17 balls cost, which is 720 bucks.
17=720.

Now,
when you sell 17 balls for 720 rupees, but the question clearly says you face a loss of '5 balls profit'.

How come? So how much does a ball exactly cost?

Lets do one thing,

Selling 17 for 720 but the loss of 5, we will minus the 5 with the 17, so,

17-5 = 12.
12 is our profit for 720. which is, 720=12!!

So,
Cost of 1 ball *12=720
Cost of 1 ball = 720/12
Cost of 1 ball = 60.