Question

In a JRC one day camp, 150gm of rice and 15ml oil are needed for a student. If there are 40 students to attend the camp how much rice and oil are needed?

Answer 1

Hint: We are given the amount of rice needed for one student. From that, we can find the amount of rice needed for 40 students by multiplying it with 40. Similarly, we are given the amount of oil needed for one student. From that, we can find the amount of oil needed for 40 students by multiplying it with 40.

Complete step-by-step answer:
We are given that 150gm of rice is needed for one student.
There are 40 students attending the camp.
So, the amount of rice needed for 40 students is given by 40 times the amount of rice needed for 1 student.
It is given by, $150 \times 40 = 6000gm$
We know that $1000gm = 1kg$ . So, we can write the amount of rice required for 40 students is 6kg.
Again, it is given that 15 ml of oil is required for one student.
There are 40 students attending the camp.
So, the amount of oil needed for 40 students is given by 40 times the amount of oil needed for 1 student.
It is given by, $15 \times 40 = 600ml$
We know that $1000ml = 1L$ . So, we can write the amount of rice required for 40 students is 0.6L.
Therefore, 6kg of rice and 0.6L of oil are needed if there are 40 students to attend the camp.

Note: Alternate solution is given by using the concept of proportionality.
Let x be the rice required for 40 students. It is given that 150gm of rice is needed for one student.
So, by proportionality, we can write,
 $\dfrac{x}{{40}} = \dfrac{{150}}{1}$
On cross multiplying, we get,
 $ \Rightarrow x = \dfrac{{150 \times 40}}{1} = 6000gm$
 $ \Rightarrow x = 6kg$
Let y be the amount of oil required for 40 students. It is given that 15 ml of oil is required for one student.
So, by proportionality, we can write,
 $\dfrac{y}{{40}} = \dfrac{{15}}{1}$
On cross multiplying, we get,
 $ \Rightarrow y = \dfrac{{15 \times 40}}{1} = 600ml$
 $ \Rightarrow y = 0.6L$
Therefore, 6kg of rice and 0.6L of oil are needed if there are 40 students to attend the camp