A box contains 200 marbles, 25% of which… | Answer

Subject

পেট্রোবাংলা

Topic

বাখরাবাদ গ্যাস ডিস্ট্রিবিউশন কোম্পানি লিঃ (সহঃ ব্যবস্থাপক - জেনারেল) - ৩১.০৩.২০১৭

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

120

খ)

125

গ)

150

ঘ)

None of these

Explanation

বাক্সে মার্বেল আছে = 200 টি কালো মার্বেল আছে = 200 এর 25% = 200 এর 25/100 = 50 টি ধরি, বাবু বাক্স হতে মার্বেল তুলে ছিলো x টি প্রশ্নমতে x এর 30% + (200 - x) এর 10% = 50 ⇒ 30x/100 + 10(200 - x)/100 = 50 ⇒ (30x + 2000 - 10x)/100 = 50 ⇒ 20x + 2000 = 5000 ⇒ 20x = 5000 - 2000 ⇒ 20x= 3000 ∴ x = 150 বাবু বাক্স হতে মার্বেল তুলে ছিলো 150 টি

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

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

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