exam Maths Puzzle Numerical Ability

owen is 3 years less then twice as old as his sister rena. if owen is 13,how old is rena?

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exam Other Question

Select the line parallel to 6x + 14y=20 Need the number of distinguishable permutations for:
ALGEBRA - i said 2520 - is that right
MISSOURI - ?????? cant get that one

Find the number of permutations: 9P4 and 16P3 (