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Choosing an Efficient Solution Method
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PSAT Prep
005 Choosing an Efficient Solution Method
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A student knows a:b = 3:5 and a + b = 64. Which approach is most efficient for finding a?
A
Graph all possible ordered pairs and estimate the one on the line.
B
Average the two ratio numbers and divide by 64.
C
Use 3 + 5 = 8 total ratio parts, then assign 64/8 to each part.
D
Subtract 3 from 5 and multiply by 64.
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