A mixture contains 2/5 of element A and 3/5 of element B. When 5ml of A is added to the mixture, the proportion of B in the mixture changes to 1/5. What amount of A was originally present in the mixture before the addition was made ?
A. 1ml
B. 1.5ml
C. 2.5ml
D. 6ml
সঠিক উত্তরঃ
A.
1ml
Explanation:
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