exam Maths Puzzle Numerical Ability

√(2-4/z^2 +2/z^4 ) find LCD

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exam Other Question

Find inverse of
a b c d
-b a -d c
-c d a -b
-d -c b a

If this is too difficult could you tell me how i go about finding the adjacent of a 4x4 matrix please. Thankyou In a girl guide camp 80girls had food for 15 days, 40 more jioned them after 3 days, for how mnay days the remaining food will suffice.