Answer= 2/5
Jacob painted 30% of the banner
Luis painted an equal amount, so we can infer that Luis painted 30% of the banner.
Jacob+Luis=
30%+30%=60%
Jacob and Luis painted 60% of the banner. To find the amount of the banner that remains unpainted, simply subtract 60% from 100%...
100%-60%=40%
Remember that percent means 'out of one hundred', so 40% is the same as 40/100. we can simplify 40/100 to 2/5
2/5 of the banner remains unpainted
