[Question]: Davida worked 35 hours on each of Weeks 1 and 2. She worked 48 hours each of Weeks 3 and 4. How many more hours did Davida work on Weeks 3 and 4 than on Weeks 1 and 2?
[Answer]: Week 1 + Week 2 = 35 + 35 = 70 hours. Week 3 + Week 4 = 48 + 48 = 96 hours. Subtract Weeks 3 - 4 from Weeks 1 - 2 = 96 - 70 = 26.
So the answer is 26.

[Question]: Lorraine made a pan of brownies and cut them into 16 pieces. Her children ate 25% of the brownies when they got home from school. After dinner, the entire family ate 50% of the remaining brownies. After everyone went to bed, Lorraine ate 1 more brownie. How many brownies are left over?
[Answer]: Her children ate 25% of the 16 brownies so they ate .25 * 16 = 4 slices. There were 16 brownies and the children ate 4 slices, leaving 16 - 4 = 12 brownies. The family ate 50% of the remaining 12 brownies so they ate .50 * 12 = 6 brownies. There were 12 brownies and they ate 6 which leaves 12 - 6 = 6 brownies. Lorraine had 1 more of the 6 remaining brownies which leaves 6 - 1 = 5 brownies.
So the answer is 5.

[Question]: On the night of the dance, 400 students show up to the party. 70% of the students who showed up were invited. If 40% of those invited to the party had their invitation revoked and were not allowed into the party, how many invited students attended the party?
[Answer]:
On the night of the dance 70 / 100 * 400 = 280 students who showed up to the party were invited. If 40% of those invited to the party had their invitation revoked, there were 40 / 100 * 280 = 112 students who showed up and had their invitation revoked. The number of invited students who attended the party is 280 - 112 = 168.
So the answer is 168.