300 ग्राम के घोल में 40% चीनी है, इसमें कितनी चीनी और मिलाई जाए ताकि जिससे कि चीनी 50% हो जाए
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300×40/100 =120gm sugar
300×50/100=150gm sugar
because
10% mixing =30gm
so that 50%=150
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