Final answer:
Lana gets 18 additional crayons.
Step-by-step explanation:
In this question, we are given that Lana has 24 crayons and then she gets some more crayons, resulting in a total of 42 crayons. To find out how many crayons Lana gets, we need to subtract the initial number of crayons from the final number of crayons: 42 - 24 = 18 crayons. Therefore, Lana gets 18 additional crayons.
Learn more about Addition of numbers