Question

20 elephants can finish 120 kg of sugarcane in 15 days. How long will ittake for 30 elephants to finish 240 kg of sugarcane?
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Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

20 days

Step-by-step explanation:

It's simple Unitary method. Without writing long confusing sentences, let's make simple equations like so,

20 elephants =15 days

120 kg = 15 days

So,

1 elephant = 15*20 days  and

1 kg = 15/ 120 days

Now,

30 elephants = (15*20)/ 30 = 10 days (for 120 kg food) - i

240 kg = (15 *240)/ 120 = 30 days (for 20 elephants ) - ii

(simple logic behind multiplying and dividing like this is - less food, less time taken to consume OR more animal, less time taken to consume and so on like that)

Now we can use either of (i) or (ii)

(i) 30 elephants = 10* 2 days = 20 days(multiplying by 2 in order to make 240 from 120)

OR

(ii) 240 kg = (30*20)/30 = 20 days (multiplying by 20 to eliminate 20 elephants (less animal, more time taken) and dividing by 30 for new number of animals (more animals, less time))

Hence, answer is 20 days.