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If Jane delivered u pizzas late, she delivered (10 – u ) pizzas in time.

  10(10 – u ) – 3u = 48

 100 – 10u – 3u  = 48

13u = 52

u = 4

So Jane had delivered 4 pizzas late.

Check : 10 * 6 + (-3) * 4 = 60 – 12= 48

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