Mattie has a rain barrel that holds 150 L of rainwater. She uses the rainwater from the barrel to water her plants. If she gives each plant in her garden 300 mL of water, how many plants can she water with a full rain barrel?

500 plants

Step-by-step explanation:

Total capacity of barrel = 150 L

1 liter = 1000 mL

Total capacity of barrel in mL = 150*1000 mL = 150,000 mL

amount of water given to each plant by Mattie = 300 mL

Let there be x plants

Then, total amount of water given to x plant by Mattie = 300*x mL

We know that full rain barrel has 150,000 mL

so total amount of water given to x plant by Mattie should be equal to full rain barrel capacity.

Substituting value of full rain barrel capacity and total amount of water given to x plant

Mathematically it can be written as

total amount of water given to x plant by Mattie = full rain barrel capacity

300*x mL = 150,000 mL

=> x = 150,000/300 = 500

Thus, 500 plants can she water with a full rain barrel.