Question

Renna wants to prepare vegetable pulao. She needs 300 grams of rice if she has to feed 4 people. How much rice is needed if the same pulao is prepared for 7 people?

Answer 1

Hint: We have been given the amount of rice that is needed for 7 people. Using a unitary method, we find the amount of rice that is needed for 1 person. We multiply that number with 7 to find the amount of rice that is needed if the same pulao is prepared for 7 people.

Complete step by step answer:
Renna wants to prepare vegetable pulao. She needs 300 grams of rice if she has to feed 4 people. So, the amount of rice required for 4 people is 300 grams.
Now usually the amount of rice required for 1 person remains constant.
So, we use the concept of unitary method to find the required amount of rice for 1 person.
For 4 people we have 300 grams of rice.
For 1 person we need \[\dfrac{300}{4}=75\] grams of rice.
Now we need to know the amount of rice that is needed if the same pulao is prepared for 7 people.
For 1 person we need 75 grams of rice. For 7 people we need \[75\times 7=525\] grams of rice.

Renna needs 525 grams of rice if she has to feed 7 people.

Note: We also could have used the concept of using variables. We would have taken x as the amount of rice that is needed for 1 person, the unitary value. Then for 4 people we need $4x$ which is equal to 300. So, that gives \[x=\dfrac{300}{4}=75\]. Then we multiply that number with 7 to find the amount of rice that is needed if the same pulao is prepared for 7 people which is $7x$ and the value will be \[7x=75\times 7=525\].