Answer:
The cost of the old ball was $100.
Step-by-step explanation:
The cost of the new ball = $300
The new ball has three times the price of his old ball.
So, let the price of the old ball be = x
As per situation, we get the equation:

Dividing both sides by 3:

=> x = 100
Hence, the cost of the old ball was $100.
Answer:
Multiple answers (Work & answers below)
Step-by-step explanation:
The answer is the first one 6/7ab
Answer:
5n
Step-by-step explanation:
:)