Billy buys 3 doze light bulbs. After changing the lightbulbs in the house, he has 15 light bulbs left. How many lightbulbs did he use?
Multiply and Divide Interger problem. Please show me steps how to solve?
(3 * 12) - 15 = ?
36 - 15 = 21
Thank you. I think I forgot to show I multiplied 3 x 12 on my show work then. I put 36 (already multplied it)Hope I don't get a point off for that part.:(
You're welcome.
To solve this problem, you can use the following steps:
Step 1: Start with the total number of light bulbs Billy bought, which is 3 dozen. Since a dozen is 12, you can multiply 3 by 12 to find how many light bulbs he bought in total: 3 x 12 = 36 light bulbs.
Step 2: Subtract the number of light bulbs left from the total number of light bulbs Billy bought to find how many light bulbs he used. In this case, there were 15 light bulbs left, so you need to subtract 15 from 36: 36 - 15 = 21 light bulbs used.
Therefore, Billy used 21 light bulbs to change the light bulbs in his house.