Question
Albert had 7 more red pens than grey pens at first. His mother then gave him 12 red pens and his schoolmates gave him 77 grey pens for Christmas. Albert realised that he now had thrice as many grey pens as red pens. How many pens did Albert have in the end?
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Albert had 7 more red pens than grey pens at first. His mother then gave him 12 red pens and his schoolmates gave him 77 grey pens for Christmas. Albert realised that he now had thrice as many grey pens as red pens. How many pens did Albert have in the end?