Hi--- I don't mean to ask for much but my SAT is tomorrow, and I just want to be perfectly prepared for it!! So, I was wondering if you guys could help me understand a few questions on this SAT preparation?

Question

anonymous · Answer

A fruit salad is made from pineapples, pears, and peaches mixed in the ratio of 2 to 3 to 5, respectively, by weight. What fraction of the mixture by weight is pineapple?

(A) 1/5
(B) 3/10
(C) 2/5
(D) 1/2
(E) 2/3

anonymous · Answer

I have no idea how to do ratios, I tried on Khan and it wasn't exactly what I was hoping/looking for...

hero · Answer

Basically, for this one, you can assume you have 2 pineapples, 3 pears and 5 peaches and a total of 10 pieces of fruit. 

So the ratio of pineapples to total fruit is 2/10 or 1/5

So therefore, the pineapples will carry 1/5 of the mixture by weight.

anonymous · Answer

Oh-- Well, you made that seem easy! xDD Alright, so if we were to do...

Something like, A pet store has various kinds of animals from fish, dogs, and cats mixed in the ratio of 8 to 12 to 16, respectively, by weight. What fraction of the mixture by kinds is fish?

8+12+16= 36
8/36?

hero · Answer

I know it's really a mixture ratio in weight, but it's just more convenient to describe it in terms of pieces of fruit.

hero · Answer

Don't forget to reduce the fraction

8/36 = 2/9

anonymous · Answer

By dividing it by the GCF?

hero · Answer

Yes, you should know how to reduce fractions by now. You're about to take the SAT.

anonymous · Answer

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The graphs of the functions f and g in the interval from x=-2 to x=2 are shown above. Which of the following could express g in terms of f?

(A) g(x)=f(x+1)
(B) g(x)=f(x)+1)
(C) g(x)=f(x+1)+1
(D) g(x)=f(x-1)
(E) g(x)=f(x)-1