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Question

Lucas orders some tennis balls from online shopping. Each tennis ball costs $20 and the shipping fee is $5 regardless of the number of tennis balls. If Lucas spent a total of $105, how many tennis balls did he order?

A
5
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B
4
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C
10
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D
15
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Solution

The correct option is A 5
Cost of each tennis ball =$20
Let the number of tennis ball be $x.
Total cost of x tennis balls =$x×20=$20x
Total money spent by Lucas =$105

Total cost of x tennis balls + Shipping fee = Total money spent
20x+5=105

Step 1: Subtract 5 from both sides of the equation to eliminate the constant on the left side of the equation.
20x+55=1055 20x=100

Step 2: Now, divide both sides by 20 to eliminate 20 on the left side of the equation.
20x20=10020 x=5

Hence, Lucas ordered 5 tennis balls.

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