In what ratio should a 20% methyl alcohol solution be mixed with a 50% methyl alcohol solution so that the resultant solution has 40% methyl alcohol in it?
Solution
Correct Answer: Option A
অনুবাদঃ 20% এলকোহলে কি অনুপাতে 50% এলকোহল মিশালে 40% এলকোহলে মিশ্রণ পাওয়া যাবে ।
যদি 20% এলকোহলে থাকলে = x
এবং 50% এলকোহলে থাকলে = y হয় তবে
প্রশ্নমতে,
20% of x + 50% of y = 40% of (x + y)
=> 10% of (2x + 5y) = 40% of (x + y)
=> 2x + 5y = 4(x + y)
=> 5y - 4y = 4x - 2x
=> y = 2x
=> x/y = 1/2
x : y = 1 : 2.
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