31. The price of sugar is reduced b...
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31. The price of sugar is reduced by 20%. Now a person can buy 500 g more sugar of 36. The original price of the sugar per kg was (1) 14.40 (2) 18 (3) 15.60 (4) 16.50

11th - 12th Class
Maths
Solution
198
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Let the price pel ( k g ) of sugar before (original) be ( x ) New price per ( k g=x^{prime}=0.8 x ) old ( cot theta operatorname{sen} g a x=frac{36}{x} ) rg [ text { New wrig sugar }=frac{36}{0.8 x}=frac{45}{x} mathrm{kg} ] given that, ( (text { New wt })-(theta 4 d w)=frac{500}{1000} mathrm{kg} ) [ begin{array}{c} frac{45}{x}-frac{36}{x}=0.5 9=0.5 x sqrt{x=18} end{array} ] original price is ( overline{2} 18 ) ans: (2) ( ₹ 18 )
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