exam Maths Puzzle Numerical Ability

Find the intensity as compared with the reference intensity of the 1906 San Francisco earthquake if it has a Ricther scale of 8.25

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exam Other Question

I came across a problem in my sisters college math book and being a math major i cant figure it out and really just want to know how for my own personal knowldege!

solve for y:

xy-5=y If 4/x = 5/3, then x =