exam Maths Puzzle Numerical Ability

Use the union rule to answer the question
If n(A)=5, n(B)=11, and n(Acap B)=3,what is n(Acup B)?

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exam Other Question

The length of the shadow of a flagpole was found to be 72 feet. The shadow of a 3 foot picket fence in line with the flagpole was 4 feet. What is the height of the flagpole? 2 x 5^0 – 3^0

would it be 10^0 - 6^0