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mr. garcia and friends  went deep sea fishing   for a week. on  a good day,mr. garcia caught 12 big fish. on a bad day,  he caught only 7 big fish. if in all he caught 64 big fish,how many good days did he have.

Sagot :

(12x, 64-12x)
60,4
48,16
36,28 so it means he had 3 good days and 4 bad days
24,40
12,52