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
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
4
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
10
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
15
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is A5 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+5−5=105−520x=100
Step 2: Now, divide both sides by 20 to eliminate 20 on the left side of the equation. 20x20=10020x=5