Question: Jenny had $24 left after spending 3/7 of her money. How much is half of her original amount of money?
Answer with step-by-step thinking: Jenny spent 1 - 3 / 7 = 4 / 7 of her money. Since 4 / 7 is equal to $24, then 1 / 7 is equal to $24 / 4 = $6. So, Jenny originally had $6 x 7 = $42. Therefore, half of her original amount of money is $42 / 2 = $21.
So the answer is 21.

Question: Roberto recently received a 20% raise from his previous salary, which was already 40% higher than his starting salary. If Roberto's starting salary was $80,000, what is his current salary?
Answer with step-by-step thinking: Roberto has received 2 raises. On his first raise he received a 40% bump, therefore his new salary was $80,000 * 140% = $112,000. On his second raise, Roberto received a 20% bump, therefore his current salary is $112,000 * 120% = $134,400.
So the answer is 134400.

Question: A couple's wedding reception had 180 people. The bride and groom had each invited 20 couples from their side of the family. The remaining guests were friends. How many friends attended the reception?
Answer with step-by-step thinking:
From the bride's side, 20 couples * 2 guests / couple = 40 guests attended. From the groom's side, 20 couples * 2 guests / couple = 40 guests attended. Therefore 180 guests - (40 guests + 40 guests) = 100 friends attended the reception.
So the answer is 100.