The answer your looking for is D
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:
60
Step-by-step explanation:
It is just 60 I did my work lol
Answer:
7 mg, 7 centigrams, 7g, 7kg