If $2$ kg of sugar costs Rs. $90$, what is the cost of $5$ kg of sugar?

If $2$ kg of sugar costs Rs. $90$, what is the cost of $5$ kg of sugar?
  1. Rs. $200$
  2. Rs. $215$
  3. Rs. $225$
  4. Rs. $250$

Solution

Cost per kg $= \dfrac{90}{2} = 45$. So $5$ kg cost $5 \times 45 = $ Rs. $225$.

Asked in: IMO

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