A jar contained some red buttons and blue buttons. At first, the number of red buttons was 75% of the number of blue buttons. After adding in another 3 buttons of each colour, the number of red buttons becomes 80% of the number of blue buttons. How many buttons of each colour were there at first?
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Answer:
blue button - 75 - 3 - 72
Step-by-step explanation:
red button - 80 - 3- 77
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