Question

A vendor supplies $ 32 $ litre of milk to a hotel in the morning and $ 68 $ litres of milk in the evening. If the milk costs $ Rs.15 $ per litre, how much money is due to the vendor per day?

Answer 1

Hint: First, we will add the liters of milk which is supplied in the morning and evening to the hotel by the vendor.
After finding the total liters that the vendor-supplied the milk, we can able to find the total money, just by multiplying the total liters by the given cost of one liter $ Rs.15 $

Complete step by step answer:
Given that the vendor supplies the $ 32 $ liter of milk in the morning to the hotel and after that, the vendor supplies the $ 68 $ liters of milk in the evening to the hotel.
We will use the method of unitary to solve the given problem.
The unitary method is to find the cost of one unit first and then multiple it into the sum of the required units.
Hence, the total quantity of the milk supplied in a day is $ 32 + 68 $ (morning and evening respectively)
Thus, in total, we get $ 100 $ litre of milk per day and the cost of the milk is given $ Rs.15 $ per liter.
Hence, the cost of $ 100 $ liters of milk is $ 15 \times 100 \Rightarrow Rs.1500 $
Therefore, the amount due to the vendor per day would be $ Rs.1500 $

Note:
We may often mistake in calculating the quantity of morning and evening as $ 32 \times 64 $
And the result after multiplied by the cost is $ 32 \times 64 \times 100 = 204800 $ but which is the completely wrong answer.
We only need to find the sum of the given liter from the morning and evening; thus, it gets the total milk supply of the day.
The addition is the sum of the two or more numbers and multiplication is the times we multiplied the number by multiplicand like $ 4 $ times $ 2 $ we get $ 2 + 2 + 2 + 2 $ and thus we get $ 8 $ as the result.