Others Maths Puzzle Numerical Ability Arithmetic

There are 5 Sub with equal high marks. Mark scored by a boy is 3:4:5:6:7 (Not sure). If his total aggregate if 3/5 of the total of the highest score, in how many subjects has he got more than 50%?

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One litre of water is added to 10 litres of a 40% solution of alcohol in water. What is the final strength of the alcohol