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the respective ratios of a and b is 9:5 . the present age of b is 54. How many years ago was their respective ratios 7:3?

In this app where I get my saved questions?

Sir in this app where I get my saved questions?

To prevent mistakes, they must be (1)/ observed, that desire here is taken (2)/ in its proper sense, viz. that (3)/ internal impulse which makes us proceed to action(4).

what is error in this question? and plz explain 

why the papers are in only English?

sir could u please add general Science also

SSC CHSL how much rs?

sir why are you not provide this app in hindi?

3 coins are thrown then prob. of getting maximum 2 tale

the length and breadth of a rectangular lawn are 36m and 20m respectively. it has two roads ,each 3m wide running in the middle of it. one parallel to the length and other parallel to the breadth , what is the cost of gravelling these roads at RS 3 per sq metre