book Maths Puzzle Numerical Ability

Jennifer, Stephanie, and Rosalyn made a total of 60 downhill runs. Jennifer made 18 runs and Stephanie made three fourths as many runs as Rosalyn. How many runs did Rosalyn make?

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book Other Question
How can you prove that:

odd + odd = even
even + even = even (you initially put even + even = odd)
odd + even = odd

???? Evaluate the following expression (sqrt3m +sqrt2m)(sqrt3m - sqrt2m) Assume m is positive