It depends on where in the world and how long ago you consider to be olden days.
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I think that they went 5 days a week. i am not sure but you can edit this if you want
If there are 55 children in the classroom then it is not possible for 61 of them ti be girls!
6 days a week
1000 billions equal a trillion but in the olden days it was a billion billions that equal a trillion.
Yes