4. A variety of rice at * 14 per kg...
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4. A variety of rice at * 14 per kg is mixed to 15 kg of another variety rice at 20 per kg, so as to make a mixture worth 16.50 per kg. The quantity of rice at * 14 per kg must be (a) 5 kg (b) 7 kg (c) 15 kg (d) 21 kg

11th - 12th Class
Maths
Solution
120
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4. (4) By alligation method, Cheaper ( therefore ) Required ratio ( =frac{3.5}{2.5}=frac{7}{5} ) Hence, when second variety is ( 15 mathrm{kg} ), then first variety ( =frac{7}{5} times 15=21 mathrm{kg} )
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