Question

Nasane can do 50 sit-ups in 3 minutes. At this rate, how many can he do in 12 minutes?

Answer 1

Hint: We are given that Nasane can do 50 sit-ups in 3 minutes and we are asked to find as to how many sit-ups can he do in 12 minutes. Here, we will use the unitary method. We will first find the number of sit-ups he can do in 1 minute, then we will multiply the result with 12 minutes. And thus, we will have the number of sit-ups Nasane can do in 12 minutes.

Complete step by step solution:
According to the given question, we are given that Nasane can do 50 sit-ups in 3 minutes. And using this information, we have to find out how many sit-ups he can do in 12 minutes.
Here, we will use the unitary method to find the required.
Firstly, we will be finding the number of sit up Nasane can do in one minute,
So, we have,
\[3\min \to 50\text{ }sit-ups\]
\[1\min \to \dfrac{50}{3}sit-ups\]
Now, we have the number of sit ups in 1 minute so, from this we can find the number of sit-ups Nasane can do in 12 minutes. We just have to multiply the number of sit-ups Nasane can do in 1 minute by 12. We have,
\[12\min \to \dfrac{50}{3}\times 12=50\times 4=200sit-ups\]

Therefore, in 12 minutes Nasane can do 200 sit ups.

Note: The calculation should be done step wise. We did the above solution using unitary method, but we can do it directly as well, that is,
\[3\min \to 50\text{ }sit-ups\]
\[12\min \to \dfrac{50}{3}\times 12=50\times 4=120sit-ups\]