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A Jar contains white, red and green marbles in the ratios 2: 3: 4. Five more green balls are added to the Jar and the ratios become 2: 3: 5. How many white balls are there in the Jar?

Correct Answer: 10
পাঁচটি সবুজ বল যোগ করে, ৪x + ৫ = ৫x বা, x = ৫ সাদা বলের সংখ্যা = ২ × x  = ২ × ৫ = ১০

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