exam Maths Puzzle Numerical Ability

How do I do this again. Please help?Please.
Solve.

x/7-1/2= x-11/2

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exam Other Question

The fuel for a two-cycle motorboat engine is a mixture of gasoline and oil in the ratio of 15 to 1. How many liters of each are in 6.6 L of mixture ? Find the rule for g if g(-3)=5 and g(1)