book Maths Puzzle Numerical Ability

a test solution of gasohol contains 60L of gasoline and 15L of alcohol. How much pure alcohol must be added so that the resulting solution is 25% alcohol?

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I need to know the symbols that is used to show the relationship between 2 intersecting lines. I know if the lines (AB and DC) are parallel the answer would be AB // DC, but what A sum of money amounting to $5.15 consists of 10 cents and 25 cents. If there are 32 coins in all, how many 25 cents are there?