10 Most Common SSAT Upper-Level Math Questions
8- A
Let \(x\) be the cost of one-kilogram orange, then:\( 2x+(2×5.2)=28.4→\)
\(2x+10.4=28.4→2x=28.4-10.4→2x=18→x=\frac{18}{2}=$9\)
9- B
Let’s review the choices provided.
A.4. In 4 years, David will be 48 and Ava will be 8.48 is not 5 times 8.
B.6. In 6 years, David will be 50 and Ava will be 10. 50 is 5 times 10!
C.8. In 8 years, David will be 52 and Ava will be 12.52 is not 5 times 12.
D.10. In 10 years, David will be 54 and Ava will be 14.54 is not 5 times 14.
E.14. In 14 years, David will be 58 and Ava will be 18.58 is not 5 times 18.
10- B
Let b be the amount of time Alec can do the job, (change 2.5 hours to 150 minutes) then:
\(\frac{1}{a}+\frac{1}{b}=\frac{1}{50}→\frac{1}{150}+\frac{1}{b}=\frac{1}{50}→\frac{1}{b}=\frac{1}{50}-\frac{1}{150}=\frac{2}{150}=\frac{1}{75}\), Then: b=75 minutes
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