First I did '1,000 + x = 2,450' Then I got 'x = 1450' But then 20 can't go into 1450 So I just add another 10 to 1450 an got 1460 1460/20 = 73! Hope this helps an is correct!!!
First the person with a flashlight and one of his friends cross the bridge. After that same person with a flashlight comes back and leads another friend to the other side. Finally he comes back again and leads the last of them. Number of times that he will have to cross the bridge is 5 ( five ).
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