OR A tank originally contains 100 gallon of fresh water. Then water
containing 0 5 Lb of salt per gallon is pourd into the tank at a rate of 2
gal/minute, and the mixture is allowed to leave at the same rate. After 10
minute the process is stopped, and fresh water is poured into the tank at a
rate of 2 gal/min, with the mixture again leaving at the same rate. Find the
amount of salt in the tank at end of an additional 10 minutes.​

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.