book Maths Puzzle Numerical Ability

Any help would be appreciated.

There are 1200 students at a University taking Precalculus. Find the number of freshmen in this course if there are three-fifths as many freshmen

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book Other Question
3x + 9=5 simplify the complex fraction : Rt=1/((1/R1)+(1/R2)+(1/R3))

in R1, R2, and R3 1,2, and 3 are subscripts