Francine drives 140km to work each day. If she does not go to work 3 days every week, find the total distance she drives to work for 4 weeks in kilometers. Give the rationale and then the answer.
Let's think step by step. There are 7 days in a week, so if he doesn't go to work for 3 days, he goes 7 - 3 = 4 days every week. He travels 140km each day for a weekly total of 140 * 4 = 560km. In 4 weeks he will travel a total of 4 * 560 = 2240km.. The answer is: 2240.

Lexie is 6 years older than her brother and her sister is twice her age. If Lexie is 8, what is the age difference between her brother and her sister? Give the rationale and then the answer.
Let's think step by step. Lexie's brother is 8 - 6 = 2 years old. Her sister is 8 x 2 = 16 years old. The age difference between her brother and sister is 16 - 2 = 14 years.. The answer is: 14.

Robie filled some plastic boxes with hockey cards. There were 10 cards in each box but 5 cards were not placed in a box. He gave away 2 boxes to his friends and he has 5 boxes with him. How many cards did Robie have in the beginning? Give the rationale and then the answer.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Let's think step by step. Robie filled a total of 2 + 5 = 7 boxes. So, he had 7 x 10 = 70 hockey cards from the 7 boxes. Thus, he had a total of 70 + 5 = 75 cards in the beginning.. The answer is: 75.