Rates and variations questions | form three Basic Mathematics

If it is known that x:y=5:1, find the value of

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UNSOLVED

Given that p varies directly proportional to q but inversely proportional to r and that, when p=35, q=7 and r=6. Find the value of p when q=2 and r=5.

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UNSOLVED

If a*b= (a²-2b)b, find the :

1. 3*2
2. n if 4*n=0.

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UNSOLVED

If y varies inversely as and x is multiplied by a. What is the ratio of the first y to the second y?.

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UNSOLVED