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

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

Related Problems
Problem 15 AMC 8 L1: Calculation Tricks
Problem 16 AMC 8 L1: Calculation Tricks
Problem 17 AMC 8 L1: Calculation Tricks
Problem 18 AMC 8 L1: Calculation Tricks
Think Academy Powered by ChatGPT