[Question]: Andrew bought a big bag of balloons. The bag had 303 blue balloons and 453 purple balloons. If Andrew shares half of his balloons with his brother, how many balloons does he have left?
[Answer]: There are 303 + 453 = 756 balloons in the bag. Once Andrew gives half of his balloons to his brother he has 756 / 2 = 378 balloons left.
So the answer is 378.

[Question]: Layla is training for a bicycle race. She rode her bicycle slowly to the high school, rode four miles around the running track at her faster, race pace, and then rode back home, slowly, on the same route. If her total mileage was 10 miles, how far is it, in miles, from Layla's house to the high school?
[Answer]: Layla rode 10 - 4 = 6 miles between home and the high school. Each leg of the round - trip journey was 6 / 2 = 3 miles.
So the answer is 3.

[Question]: Bob wants to build a pyramid out of legos with 3 levels where the bottom level has 7 legos per side and each level has one less lego per side than the level below it. How many legos total will he need?
[Answer]:
First find the total number of legos on the bottom layer: 7 legos * 7 legos = 49 legos. Then find the number of legos per side on the next layer: 7 legos - 1 lego = 6 legos. Then find the total number of legos on the second level: 6 legos * 6 legos = 36 legos. Then find the number of legos per side on the top level: 6 legos - 1 lego = 5 legos. Then find the total number of legos on the top level: 5 legos * 5 legos = 25 legos. Then add the number of legos on each level to find the total number of legos: 49 legos + 36 legos + 25 legos = 110 legos.
So the answer is 110.