The cost of 140 tennis balls is Rs.4900. Find the cost of 2 dozen such balls.
More the no of tennis balls, more will be the cost. So it is a direct proportion.
Let the cost be Rs x, 
⇒ x = 
= Rs 840
2
The cost of 140 tennis balls is Rs.4900. Find the cost of 2 dozen such balls.
More the no of tennis balls, more will be the cost. So it is a direct proportion.
Let the cost be Rs x,
⇒ x = = Rs 840