Explanation:
If there are two batteries in each flashlight in 4 flashlights there are 8 batteries total. This is because two batteries times 4 flashlights equals 8 batteries total. In 6 flashlights with 2 batteries in each one multiply 6 flashlights by 2 batteries to get 12 batteries total. So in 4 flashlight there is 8 batteries total and in 6 flashlights there is 12 total batteries. 12 batteries-8 batteries=4 batteries. 6 flashlights require 4 more batteries than 4 flashlights.