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Maths Puzzle
Numerical Ability
What is the answer to -7 2/5+ 2 4/5=y
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book Other Question
cross multiply the proportion
500x=(x-5)(500+5x)
Cross multiply and solve
600(x+20=(600-x)/x
solve 12(9-x)+12(9+x)=3
finally
x^2+24=(x+1)^2-25
Simplify: -12^-2