book Maths Puzzle Numerical Ability

Considering a logarithm being an
exponent, what would logb(ba) equal?

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what is the equation of the line passing through (0,15) perpendicular to the graph of y=-3/4x+2/3???

thanks. a jar contains 5-gram bolts and 10-gram bolts. the contents of the jar weigh 2.35 KG (1000g=1KG). if there are 300 bolts altogether, how many are there of each kind?