exam Maths Puzzle Numerical Ability

A company recently downsized its number of employees by 35%. if there are still 78 employees, how many employees wre there prior to the layoffs?

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Please help me solve this equation:

5x^-4 after the little arrow its suppose to be a negative 4. So its 5 times x and then a negative exponent which is negative 4

Thank You If f(x) = 7x^5 - 3, then f ^-1(x) =

a. [(x + 7)/5]1/3
b. [(x + 3)/5]1/7
c. [(x + 5)/7]1/3
d. [(x + 7)/3]1/5
e. [(x + 3)/7]1/5
f. [(x + 5)/3]1/7
g. none of these