exam Maths Puzzle Numerical Ability

If leah is 6 years older than her sister,Sue, and John is 5 years older than Leah, and the total of their ages is 41. Then how old is sue?

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Trains at each end of the 50.0 km long Eurotunnel under the English Channel start at the same time into the tunnel. Find their speeds if the train from france travels 8.0km/h faster than the train from England and they pass in 17.0 min. Find the equation of the line through (4,3) perpendicular to the line 3x + y =7
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