exam Maths Puzzle Numerical Ability

solve the equation if possible
15/x-4=6/x+3
thanks a lot

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exam Other Question

The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is normal and 20% of the cars are older than 22.8 years, find the standard deviation. Mom baked a cake for the entire family. Dad ate 1/6 of the cake. Brother ate1/5 of it. Sister ate 1/4 of what was left after that. Spot ate 1/3 of what was left. Baby sister ate 1/