Nathaniel made note of all the bicycles and cars he could see parked or locked on a certain city block. All the cars had exactly four wheels, and all the bicycles had exactly two wheels. How many wheels were on the block if there were 15 bicycles and 3 cars? How many wheels were on the block if there were xx bicycles and yy cars?
Answer
Attempt 1 out of 2
Total wheels, 15 bicycles and 3 cars:
Total wheels, xx bicycles and yy cars:
Total wheels, 15 bicycles and 3 cars:
The total number of wheels on the bicycles is 15 bicycles x 2 wheels/bicycle = <<15*2=30>>30 wheels.
The total number of wheels on the cars is 3 cars x 4 wheels/car = <<3*4=12>>12 wheels.
Therefore, the total number of wheels on the block is 30 wheels + 12 wheels = <<30+12=42>>42 wheels.
Total wheels, xx bicycles and yy cars:
The total number of wheels on the bicycles is xx bicycles x 2 wheels/bicycle = 2xx wheels.
The total number of wheels on the cars is yy cars x 4 wheels/car = 4yy wheels.
Therefore, the total number of wheels on the block is 2xx wheels + 4yy wheels = 2xx + 4yy wheels.