i need help with this question ´so plzz help
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A box has some red and black racket balls. The Ratio of number of red balls to the number of black balls is 4:5. If the bag contains 100 balls, then how many blue balls are there in the bag?
This kind of situation can be solved using cross multiplication that is;
By cross multiplying we get;
solving for y we get;
Thus, there are 80 red balls in the sack
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