Question
A fruit stall had 2 times as many grapefruits as mangosteens. After 15 grapefruits were sold, the number of mangosteens became thrice the number of the remaining grapefruits. How many grapefruits were there at the fruit stall at first?
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A fruit stall had 2 times as many grapefruits as mangosteens. After 15 grapefruits were sold, the number of mangosteens became thrice the number of the remaining grapefruits. How many grapefruits were there at the fruit stall at first?