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A box contains 200 marbles, 25% of which are of black colour. Babu took some marbles from the box found that 30% of them are black. Of the remaining marbles, 10% were black marbles. How many marbles did Babu take?

A box contains 200 marbles, 25% of which are of black colour. Babu took some marbles from the box found that 30% of them are black. Of the remaining marbles, 10% were black marbles. How many marbles did Babu take? Correct Answer 150

200 এর 25% = ( 200 × 25)/100 = 50 সুতরাং, বাক্সটিতে কালো মার্বেল আছে 50 টি। ধরি, বাবু বাক্স হতে x টি মার্বেল তুলেছিল। বাক্সে মার্বেল অবশিষ্ট রইল ( 200 - x) টি প্রশ্নমতে, x এর 30% + ( 200 - x) এর 10 % = 50 বা, 30x/100 + ( 200 - x)/100 = 50 বা, 3x /10 + 200 - x/10 = 50 বা, 3x + 200 - x = 500 বা, 2x = 300 x = 150 অর্থাৎ, বাবু 150 টি মার্বেল তুলেছিলো।

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