21 A:

72
+36
+18
+9
+4.5
+2.25
+1.125 (now he cant make 1 complete new sigerate) so only
+.57
===============

143.445

total 143.445 sigrate





22-B


their month can be changed
first one may born in February
and second one in the month of November same date and same year.

bcoz, the each date of these two months have the same day except Leap years.

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My GoaL is to be a Failure! If I reach my GoaL, I'll be Successful and if I don't reach my GoaL, I'll still be Successful.
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Habibrahet