X, Y and Z had have dinner together. The cost of the meal of Z was 20% more then that of Y and the cost of the meal of X was 5/6 as much as the cost of the meal of Z. If Y paid ₹ 100, then what was the total amount that all the three of them had paid?

Given that,
The cost of meal of Y = ₹ 100
Now, according to the question,
The cost of the meal of Z = 20% more than that of Y
The cost of the meal of Z = (100 + 100 x 20 %) = (100 + 100 x 20/100 ) = (100 + 20) = ₹ 120
and the cost of the meal of X = 5/6 as much as the cost of the meal of Z = 5/6 x 120 = ₹ 100
∴ Total amount that all the three has to be paid = 100 + 120 + 100
Total amount that all the three has to be paid = ₹ 320