Ahmed and Emily are having a contest to see who can get the best grade in the class. There have been 9 assignments and Ahmed has a 91 in the class. Emily has a 92. The final assignment is worth the same amount as all the other assignments. Emily got a 90 on the final assignment. What is the minimum grade Ahmed needs to get to beat Emily if all grades are whole numbers? Give the rationale and then the answer.
Let's think step by step. Ahmed has scored 819 total points in the class thus far because 9 x 91 = 819. Emily had scored 828 total points before the final assignments because 9 x 92 = 828. She scored 918 total points after the final assignment because 828 + 90 = 918. Ahmed needs to score a 99 to tie Emily for the semester because 918 - 819 = 99. Ahmed needs to score a 100 to beat Emily for the semester because 99 + 1 = 100.. The answer is: 100.

Benny has bought a new piggy bank and wants to start saving money. In January he adds $19, then adds the same amount in February. By the end of March, he has $46. How many dollars did he add to the piggy bank in March? Give the rationale and then the answer.
Let's think step by step. In January and February, Benny added 19 + 19 = $38 to the piggy bank. Calculating the difference between this and the total he has at the end of March shows that he saved 46 38 = $8 in March.. The answer is: 8.

Mia is buying Christmas gifts for her family. She has spent $30 on each of her 3 siblings, and the rest of her spending was for her parents. If Mia spent a total of $150 on Christmas gifts and each of her parents received gifts of equal value, how much money, in dollars, did she spend on each parent's gift? Give the rationale and then the answer.
Let's think step by step. Mia spent a total of $30 per siblings * 3 siblings = $90 on her siblings. She therefore spent $150 total spending - $90 spending on her siblings = $60 on her parents. As each parent received an equal amount, each parent's gift cost $60 total spending on parents / 2 = $30.. The answer is: 30.