In each of the number-pairs, the second number is obtained by performing a certain mathematical operation on the first number. Three of the following pairs follow the same pattern and thus form a group. Select the number-pair that does NOT belong to that group.
The logic is- 62 x 2 + 3 = 127 235 x 2 + 3 = 473 160 x 2 + 3 = 323 433 x 2 + 3 = 869
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In what ratio must a person mix three kinds of rice costing him Rs 1.16,Rs 1.40 and Rs 1.72 per Kg so that the mixture may be worth Rs 1.37 per Kg?
