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MyRealName
Registered User Posts: **595** Member

Post edited by MyRealName on

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## Replies to: How to do these 2 Math problems?

595Member260Junior Membersince the car travelled 10 miles with a speed of 20m/h, so the car travelled exactly half an hour.

Likewise, for the second 10 miles, the car travelled 1/4 hour, which is 15 minutes.

So in general, the car travelled 20 miles in 1/2+1/4 hour

so we know the speed is 20/0.75 = 80/3

For the 2nd question

the fence actually is the flap places at both sides of the stretch. So you know that there will be totally 500/5 stretchs, but the fence will have one more number to be added since the fence separates the stretch into 50 pieces.

Let me know if you have any questions. :)

595MemberFor the 2nd question: How come you add only one more number? There are two posts placed at each end, so shouldn't you add two?

1,289Senior Memberhttp://talk.collegeconfidential.com/sat-preparation/1493390-advanced-sat-math-strategies-those-want-800-math-3.html

1,079Senior Member25,441Senior MemberFor your first, there is nothing easier than applying the simple formula

2.S1.S2 / S1 + S2 when S is the speed given in the typical SAT problem. Apply it here and you get

2.20.40 / 20+40 or 800/30 and 80/3.

Takes about 5 to 10 seconds, once you know how to recognize the problem.