In what ratio must we mix pulses priced at Rs 19.30 per kg with the pulses priced at Rs 20.80 per kg so that the mixture is worth Rs 20 per kg?

7:8 7:6 8:7 6:7

8:7

let C = Rs.19.30 / KG , D = Rs. 20.8/ KG and M = Rs. 20 / KG Then the ratio of mixes is (D-M): (M-C)