
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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October 29th, 2018, 02:25 AM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 343 Thanks: 1  Why 40 million ? why not just 40?
Income of two companies A and B are in the ratio 5:8. Had the income of company A been more by Rs 25 million, the ratio of their income would have been 5:4 respectively. What is the income of company B? A) Income of two companies A and B = 5: 8 → 5X : 8X New ratio after adding 25 million = 5X/8X + 25 = 5/4 → (X+5)/2X = 1 → X = 5 Substitute X value in 8X to get income of company B → 5*8 = 40 million Here in last step; 5*8 is 40, but answer is 40 million. How so? 
October 29th, 2018, 03:28 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,868 Thanks: 1833 
If company A has income of Rs 5X and company B has income of Rs 8X, (5X + 25 million)/(8X) = 5/4, which implies X + 5 million = 2X, and so X = 5 million. Hence company B has income of Rs 8X = Rs 8*5 million = Rs 40 million. 

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