Question

. If the cost of 1 kg apple is Rs 80, find the cost of 2 ½ kg of apple​

Answer 1

Complete step-by-step solution -
In this question, we have been asked to find the cost of 27 kg of apples when it is given that the cost of 5 kg of apples is Rs. 600. Now, we know the concept of unitary method, that is, a technique for solving a problem by first finding the value of a single unit and then finding the necessary value by multiplying the single unit value or we can write it mathematically as, cost of n items = cost of 1 item ×
n, and the cost of 1 item = cost of m itemsm
.
Now, we have been given that 5 kg of apples cost Rs. 600. So, we can say that 1 kg of apples will cost 6005
= Rs. 120.
Now, we have been asked to find the cost of 27 kg of apples. So, we can say that, when 1 kg of apples costs Rs. 120, that means, 27 kg of apples will cost 120×27
= Rs. 3240.
Hence, we can say that, if 5 kg of apples costs Rs. 600, then 27 kg of apples will cost Rs. 3240.

Note: We can also solve this question by directly multiplying the cost of 5 kg apples that is Rs. 600 with 275
because, we have been asked to find the cost of 27 kg apples and we have been given the cost of 5 kg apples. But it can turn into confusion, if we forget the conventional method. So, it is better to use the unitary method to solve this question. Mark me brainiest