Mathematics, 10.02.2021 18:40, jeremiaht7

Mr Lim put some red pens and blue pens into a box . The ratio of the number of red pens to the number of blue pens was 3: 4 .He pet another 20 red pens into the box and the ratio of the number of red pens to the number of blue pens became 2:1 (a) How many red pens were there in the end? (b) How many blue pens were there?

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Mr Lim put some red pens and blue pens into a box . The ratio of the number of red pens to the numbe...