On Tuesday John brought eight hats. On Wednesday half of all the hats that he had were destroyed. On Thursday there were only 20 left. how many did he have on Monday?
Suppose he had N hats on Monday.
On Tuesday he had N + 8 hats.
On Wednesday he had (N + 8)/2 hats.
On Thursday (N + 8)/2 = 20
Multiply both sides by 2
N + 8 = 40
Subtract 8 from both sides
N = 32
This is how many hats he had on Monday.
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Suppose this was real, and your parents get super mad, then what would you do?