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1. An inspector checks machine A every 3 days and machine B every 6 days. The
inspector checked both machines on May 31st. Look at the calendar below, and
find all the dates on which the inspector checks both machines in June.

June

Sun Mon Tue Wed Thu Fri Sat
123456

7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30

2. Ann is drawing black dots on a line after every 4 cm and white dots after every 6
cm. Where will she draw both the black and the white dots at the same time?

6 cm 24 cm
4 cm
0 cm
   17   18   19   20   21   22   23   24   25   26   27