exam Maths Puzzle Numerical Ability

Solve the system by using the addition method. -0.1x+0.05y=5 and 0.05x+0.06y=2.7 What is x?

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exam Other Question

A cereal company has announced a contest in which it is giving away a mountain bike. To win the bike you must collect the letters"YOU WIN". There is one letter in each of the speci I am trying to write each expression as a single logarithm this is the problem i am stuck on

ln(x+2)-7ln(x)+3ln(x+7)