Test 4 Section 6 - #15 (page 597)

Even though this is a grid-in question, we can actually plug-in to solve. That's because they don't ask us for the areas themselves, they ask us for the RATIO of the areas.

Say QS = 1, QV = 3, PT = 3, and PR = 4. That's going to mean that SV = 2, since it's the difference between QV and QS.

Our areas:

▵PST = ½(SV)(PT) = ½(2)(3) = 3
▵PQR = ½(QV)(PR) = ½(3)(4) = 6

So the ratio of ▵PST to ▵PQR = 3/6, or 1/2. You could also grid in .5.

Test 4 Section 6 - #6 (page 594)

This one works kinda like a ratio problem. The key is to recognize that if the ratio of white eggs to brown eggs is 2 to 3, then the ratio of, say, white eggs to TOTAL eggs is 2 to 5. (You could also, of course, do brown eggs to TOTAL eggs 3 to 5. Potayto potahto.)

The total number of eggs in the basket has to be a multiple of 5. The only answer choice that isn't is (B) 12, so that's the answer.

2010 PSAT - Saturday - Section 4 (Math)

The following are TestTakers' suggestions for solving the problems on the October 16th, 2010 PSAT, Section 4 (a math section). Click "Read More" to view!

2010 PSAT - Saturday - Section 2 (Math)

The following are TestTakers' suggestions for solving the problems on the October 16th, 2010 PSAT, Section 2 (a math section). Click "Read More" to view!

Test 1 Section 7 - #11 (page 417)

If they're telling us she has a 2/5 probability of picking a brown towel, we can think of 2/5 as the ratio of brown towels to all the rest of the towels in her closet.  Since they tell us she has 6 brown towels, we can set up a proportion to solve for the total towels:

Cross multiply to solve, and you'll see she has x = 15 total towels.