One robot assembles 18 parts per hour and another assembles 12 per hour. How many parts will they assemble together in 4 hours?
Show hints
- First add the robots’ hourly rates.
- Multiply 18 + 12 by 4.
Show the answer and solution
Answer: 120
Together the robots assemble 18 + 12 = 30 parts per hour. In 4 hours they assemble 30 × 4 = 120 parts.