Q: Thomas wants to throw a party for his best friend Casey. He needs to order enough chairs for all the party guests to sit in, one for each guest. First he orders 3 dozen chairs for 3 dozen guests he invites. Then he finds out that 1/3 of the guests want to bring a guest of their own, so Thomas needs to order more chairs. Eventually, Thomas finds out that 5 of the guests he originally invited can't make it. Thomas would also like to order 12 extra chairs just in case they need them. How many chairs is Thomas going to order for Casey's party?
A: Thomas originally orders chairs for 3 dozen guests, 12 x 3 = 36 guests. Thomas finds out that 1 / 3 of the guests want to bring a guest of their own, 1 / 3 of 36 = 12. The 12 guests bring a guest of their own each, 36 guests + 12 guests = 48. Thomas finds out that 20 of the guests can't make it, 48 guests - 5 guests = 43. Thomas wants to order an extra 12 chairs, 43 + 12 = 55. Thomas will need 55 chairs for the party. The answer is 55.

Q: Anna has 50 pencils and Harry has twice the number of Anna’s Pencils but he lost 19 of them. How many pencils are left with Harry?
A: The number of Harry’s pencils is 50 * 2 = 100 pencils. The number pencils left is 100 – 19 = 81 pencils. The answer is 81.

Q: Jonathan eats 2500 calories every day except for Saturday, when he consumes an extra 1000 calories. He burns 3000 calories every day. What is his weekly caloric deficit?
A:
He consumes 2500 + 1000 = 3500 calories on Saturday. He consumes 2500 * 6 + 3500 = 18500 calories in the week. He burns 3000 * 7 = 21000 calories in the week. His caloric deficit is 21000 - 18500 = 2500 calories per week. The answer is 2500.