exam Maths Puzzle Numerical Ability

I need to express the following into a single logarithm but I have no idea how to do this. Could someone please explain the steps to me? Thanks so much.

Log_c_K + Log_c_P

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exam Other Question

in the fraction 3/*, * may not be substituted by which of the following sets?
a) {1,2,4} b) {-2, -3, -4} c) {1,3,7} d) { 0, 10, 20 } e) { 1.8, 4.3}

help me.......thanks in advance
solve

a - 1/3 = -2/5