exam Maths Puzzle Numerical Ability

Simplify this question: 4+|3-1|

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Devin has pennies, dimes and quarters. There are two times as many pennies as quarters. There are six times as many dimes as quarters. How many of each coin does he have? the resistance(R) of a wire is directly proportionnal to its lenght(L). knowing that for a wire 10 metres, the resistance is 0,03. calculate the lenght of yarn whose resistance is 0,36.