Touring China and Thailand
Date: 5/30/96 at 1:49:34 From: Eric Liu Subject: How long is the tour? Hi! This is Cristian. I have two math questions: 1. A tour to China is twice as long as a tour to Thailand. If both tours last 5 weeks and 1 day altogether, how long is the tour to China? 2. The total of the ages of Janet and Pam is 21 years and 1 month. If Janet is 7 months older than Pam, how old is Pam? Thank you very much.
Date: 6/5/96 at 18:9:44 From: Doctor Jodi Subject: Re: How long is the tour? Hi there! Thanks for your questions! Let's say that the tour to Thailand lasts x days. Then the tour to China lasts twice as long, 2x. Now, since there are 7 days in a week, together the tours last (5 weeks * 7 days/week) + 1 = 36 days The tours last 36 days = 2x + x China Thailand Does this make sense so far? Now, 2x + x = 3x, so we can rewrite this as 36 = 3x Now we divide each side by 3 to get 36 3x -- = -- 3 3 which we can rewrite as 12 = x Now we have to go back up to our list to remind ourselves that x stands for the number of days in Thailand. But we are looking for the number of days spent in China, which is 2x or 24. So the answer is 24 days. Does that make sense? The next problem is similar so I'll just get you started on it: Pam = x months Janet = x + 7 months Total age = 21 years + 1 month = (21 years * 12 months/year) + 1 month = 253 months 253 = x + x + 7 Can you finish this problem? Let us know if you need more help. -Doctor Jodi, The Math Forum Check out our web site! http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.