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Math Questions I need help on [#permalink]
28 Feb 2009, 14:01

So the following 5 math questions I am having difficulty figuring out how to get to the answers given...any help would be much appreciated. Thanks!

1) Fox jeans regularly sell for $15 a pari and Pony Jeans regularly sell for $18 a pair. During a sale these regular unit prices are discounted at different rates so that a total of $9 is saved by purchasing 5 pairs of jeans: 3 pairs of Fox Jeans and 2 pairs of Pony Jeans. If the sum of the two discount rates is 22 percent, what is the discount rate on Pony Jeans?

Answer: 10%

2) If [x] is the greatest integer less than or equal to x, what is the value of [-1.6]+[3.4]+[2.7]?

Answer: 3

--> Since this adds to 4.5 and it says the greatest integer less than or equal to x, I would have thought the answer was 4 (this was one of the choices, but not the right answer so not sure what I'm missing here).

3) Two triangles are shown with the same measurements for each angle: if the base of the smaller triangle is denoted s and the base of the larger triangle is denoted S, what is s in terms of S if the larger triangle has an area 2 times that of the smaller triangle?

Answer: S=s*the square root of 2

4) What is the greatest prime factor of 4^17-2^28

Answer: 7

5) square root of ((9+square root of 80)+square root of(9-square root of 8))^2

2, -2 + 3 + 2 = 3 since [x] is the greatest integer less than or equal to x [-1.6] = -2 since -2 is less than -1.6 and a integer similarly the other 2

3, two triangles are equilateral. side is given, hence height = ((sqroot of 3)/2) *a. then use 1/2b*h and equate, u will get s2 = S2

4, simplify 2power34-2power28 2pwr28(2power6-1) 2pwr28(64-1) = 2pwr28(63) 63 is written as 7*9, hence the highest prime factor is 7, since the other factors are 2 and 3

5, i tried it, but got something like sqrt of 18 + sqrt of 19, i think i did not get u r expression right.