David is making rice for his guests based on a recipe that requires rice, water, and spice, where the rice-to-spice ratio is 4:1. He currently has 20 grams of the spice, but he is all out of rice. He wants to make 2 servings, where each serving has 20 grams of spice. He, therefore, goes to the store and spends $3.20 on rice. What is the price of rice per gram?

$0.02

Step-by-step explanation:

The rice-to-spice ratio is 4:1.

Each serving has 20 grams of spice

This means:

4/1 = x/20

Cross Multiply

x = 4 × 20

x = 80

Each servings = 80 grams of rice and 20 grams of spice

We are told that:

He wants to make 2 servings, where each serving has 20 grams of spice. He, therefore, goes to the store and spends $3.20 on rice.

2 servings= 2 × 80 grams of rice

= 160 grams

He goes to the store and spends $3.20 on rice.

Hence,

160 grams = $3.20

1 gram = x

Cross Multiply

160 × x = 3.20

x = 3.20/160

x = $0.02

The price of rice per gram is $0.02

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

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