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ngarciax546
Jeremiah didn't use the same amount of water.
He could improve it by using the same amount of water.

The two didn't put them at the same time.
The two can put the candy in their mouth at the same time.

 
lhk7
Since 2 and 3 were already answered I'm gonna answer 4.
Demetrius didn't use balls of equal weight.
He should use balls of equal weights.