exam Maths Puzzle Numerical Ability

Simplify and (show your work)

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3/5 divided by 1 and 1/5 x 1 and 2/3

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exam Other Question

simplify

radical 18 - radical 50

12 radical x + 2 radical x

i solved them for the first one i got -30 and the second one i got 24x but i dont know if i am doing them correct i need to see the steps A sailboat sail in the shape of an isosceles triangle has a base that is 9 feet longer that either of the equal sides. If the perimeter of the sail is 21 feet, then what is the length of the base of the sail?