exam Maths Puzzle Numerical Ability

Find an equation of variation for the given situation.
r varies diretcly as s, and r=0.0909 when s=1

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exam Other Question

Subtract and write the answer in simplest form.

34 2/3-16 5/6

I have been trying to solve this but the answer on my answer sheet is completely different from my answer. Please help! I cannot get this problem to work out right. Can you please help me solve it step by step?