exam Maths Puzzle Numerical Ability

In 1984, the eiffel tower was 19/20 as old as the washington monument. if the washington monument was built 5 years earlier than the eiffel tower, find the age of each in 1984. PLE

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exam Other Question
x^2-4-0 , 3x+x^2=0, x^2-10x+2=0 , 4x^2-16x=-16 simplify

sqrt125/sqrt5