exam Maths Puzzle Numerical Ability

If James is 3 times the age of Eric, and 5 years ago James was 4 times the age of Eric how old are they each?

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exam Other Question

x+2y=7 2x+2y=13 Give the vector from (1, 0, 2) to (3, -2, 5).

Give a vector that has the same direction as the vector from that problem but in unit length.