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Chapter 3   

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Cookies Crumble

solution

There were 12 cookies in the first batch.
Each of the children ate 6 cookies in all (3 from each batch).

explanation
Work backward.

  • At the end, there were 4 cookies left on the tray.
  • Each of the children ate 3 cookies from the second batch.
    4 x 3 = 12
  • Add the 12 cookies they ate to the 4 cookies left on the tray.
    12 cookies + 4 cookies = 16 cookies
  • Mr. Ortiz ate 2 cookies.
    Add: 2 + 16 = 18
  • 6 cookies crumbled. Add: 18 + 6 = 24
  • There were 24 cookies in the second batch.
  • The second batch was twice as big as the first batch; 24 ÷ 2 = 12
  • There were 12 cookies in the first batch.
  • To find the number of cookies each child ate in the first batch; Divide 12 cookies by 4 children: Each child ate 3 cookies.
  • 3 cookies from the first batch + 3 cookies from the second batch = 6 cookies for each child.

 


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