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23 March, 17:22

Kira's penny bank is

2/3full. After she removes

160 pennies, it is

4/9 full. How many pennies can Kira's bank hold?

+5
Answers (2)
  1. 23 March, 17:33
    0
    Compare

    2/3 to 4/9

    make denom the same

    2/3 times 3/3=6/9

    from 6/9, she removes 160 to get 4/9

    6-4=2

    therefor

    6/9-2/9=4/9

    also

    2/9=160 coins

    times 1/2

    1/9=80 coins

    times 9

    1=720 coins

    can hold 720 coins
  2. 23 March, 17:39
    0
    2/3 = 6/9

    so removing 160 pennies gets rid of 2/9 of the jar

    which means 160 = 2/9 and 80 = 1/9

    to find out the max amount you can multiply 9 x 80

    and get 720.
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