exam Maths Puzzle Numerical Ability

Hi,I was wondering if I was doing this problem correctly.
3/4 (three fourths) times the sqrt of negative 144
The answer I got was 108i, is that correct?
Thank you for your time.

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exam Other Question

this year your brother james
will be 2 years from being twice as old as your sister jenny. The sum of james age and 3 times jennys age is 66. How old is Jenny write the approximate percent for the following fractions.

a.25/32 b.17/40 c.75/120 d.36/140