Find the ratio in which a grocer should mix two varieties of pulses costing ₹75 and ₹90 per kg, respectively, so as to get a mixture costing ₹80 per kg.

2 : 1

⇒ The ratio in which a grocer should mix two varieties of pulses costing Rs.75 and Rs.90 per kg, respectively, so as to get a mixture costing Rs.80 per kg = 10 : 5 = 2 : 1.