TAILIEUCHUNG - Sat - MC Grawhill part 35

I have also talked to many of my best students and my colleagues with high-school age children, and the consensus is pretty much unanimous: McGraw-Hill's SAT I is the only one that seems to provide just about everything students really need to prepare seriously for the new test. The biggest problem, I've found, with books like Princeton Review, Up Your Score, and REA, is that they repeat the same test-taking "tricks" that have been around for decades, and really don't help most students all that much | 330 McGRAW-HILL S SAT 7. When the Apex Pet Store first opened the ratio of cats to dogs was 4 to 5. Since then the number of cats has doubled while the number of dogs has increased by 12. If the ratio of dogs to cats is now 1 to 1 how many cats did the store have when it opened 9. A jar contains only red green and blue marbles. If it is three times as likely that you randomly pick a red marble as a green marble and five times as likely that you pick a green one as a blue one which of the following could be the number of marbles in the jar A B C D E 38 39 40 41 42 8. Hillside High School has 504 students. One-quarter of the students are sophomores and 3 7 of the sophomores are boys. If one-third of the sophomore girls take French how many sophomore girls do not take French A B C D E 24 36 48 72 126 CHAPTER 8 ESSENTIAL ALGEBRA I SKILLS 331 Answer Key 7 Word Problems Concept Review 7 1. m Mike s current age d Dave s current age m 2 d - 5 2. a the population of town A b the population of town B a 3. n number of marbles in the jar n - 2 3 n 5 1 6 n 4. b number of blue marbles r number of red marbles b 4 2r 5. c cost of one candy bar 1 cost of one lollipop 3c 21 and 4 c 21 . Subtract 4c 21 - 3c 21 c .60 Plug in to find 1 3 .60 21 Simplify 21 Subtract 21 .40 Divide by 2 1 .20 SAT Practice 7 1. C You could test the choices here or do the algebra Multiply by x Add x Divide by 4 24 - x 3 x 24 - x 3x 24 4x 6 x 2. n Nora s current age m Mary s current age. Interpret first sentence n - 3 1 2 m Interpret second sentence m n 4 Subtract 4 m - 4 n Substitute n m - 4 m - 4 - 3 1 2 m Simplify m - 7 1 2 m Subtract m -7 - 1 2 m Multiply by -2 14 m 3. E p q 9 7 q r 14 3. I p II q p I 9 ll 14 6 Multiply K p- t l 1 7 I q JI r r I 7 JI 3 . 1 4. 40 J number of books Joan had originally. E number of books Emily had originally. J 2E. After the exchange Emily has E 5 and Joan has J - 5 books so J - 5 10 E 5 . Simplify J - 5 E 15 Subtract 15 J - 20 E

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