AMC 8 L1: Calculation Tricks

Complete problem set with solutions and individual problem pages

Problem 19 Medium

Suppose that A☆B means 3A-2B. What is the value of x if x☆ (4☆1) =7?

  • A.

    7

  • B.

    8

  • C.

    9

  • D.

    10

Answer:C
Solution

x☆ (4☆1) =x☆ (3\times 4-2\times 1) =x☆10=3x-20=7 \Rightarrowx=9.

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