exam Maths Puzzle Numerical Ability

The following table shows gender and soda preference of 300 people sampled:

Soda Preference
Gender Diet Soda Regular Soda No Soda Totals
Male 70 40 20 130
Female 110 45 15

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exam Other Question

I am doing my homework assignment and I come across this problem...
squareroot sign 28 + 4 squarroot sign 7 - 2 squareroot sign 24
I know I should be able to figure this out, but my brain is fried!!!
x-2y<5