In what ratio must a grocer mix two varieties of pulses costing Rs. 15 and Rs. 20 per kg respectively so as to get a mixture worth Rs. 16.50 kg?
[A].
3 : 7
[B].
3 : 7
[B].
5 : 7
[C].
7 : 3
[D].
7 : 5
Answer: Option C
Explanation:
By the rule of alligation:
| Cost of 1 kg pulses of 1st kind Cost of 1 kg pulses of 2nd kind |
||
| Rs. 15 | Mean Price Rs. 16.50 |
Rs. 20 |
| 3.50 | 1.50 | |
Required rate = 3.50 : 1.50 = 7 : 3.