×
Custom Search
cancel
×
×

# Mixture and Alligation #21

 21. How many kg of rice at Rs.6.60 per kg be mixed with 56 kg of rice at Rs.9.60 per kg to get a mixture worth Rs.8.20 per kg? A. 56 kg B. 52 kg C. 44 kg D. 49 kg

Explanation:

By rule of alligation,

 Cost of 1 kg of 1st kind rice Cost of 1 kg of 2nd kind rice 6.6 9.6 Cost of 1 kg of the mixture 8.2 9.6 - 8.2 = 1.4 8.2 - 6.6 = 1.6

Quantity of 1st kind rice : Quantity of 2nd kind rice = 1.4 : 1.6 = 7 : 8
=> Quantity of 1st kind rice : 56 = 7 : 8
=> Quantity of 1st kind rice $=56 × \dfrac{7}{8} = 49$

2015-09-09 20:04:31
Hello,
why 56*(7/8)?

it should be 56*7/(7+8)?