Final answer:
The total amount of water used is 200 liters.
Step-by-step explanation:
To calculate the amount of water used, we need to find the total capacity of the tank and then subtract one-third of that capacity. The tank can hold 300 liters, so one-third of the tank's capacity is 300/3 = 100 liters. Therefore, the total amount of water used is 300 - 100 = 200 liters.
The student's question asks how much water Lin used for construction if a tank can hold 300 liters and Lin used a tank and a third.
To solve this problem, you first need to calculate the amount of water in one tank, which is given as 300 liters. Then you need to calculate a third of that amount, which is 100 liters (300 liters ÷ 3). Finally, add the two amounts together to find the total water usage.
300 liters (one tank) + 100 liters (a third of a tank) = 400 liters
So, Lin used a total of 400 liters of water for construction purposes.