RATIO AND PROPORTION FORMULA 

BY GO WITH NOTES 

• If x% of a number (N) is y, then N = y/x x 100
• If x1% and x2% of a number (N) are N1 and N2 respectively, then 

• If a number increased by x% and then decreased by x% or is decreased by x% and then increased by x%, then the original number decreases by 

• If “a” exceeds “b” by x%, then “b” is short of “a” by 

• If “a” short of “b” by x%, then “a” exceeds “b” by 

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GO WITH NOTES