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3. In the number chart shown below, the multiples of 3 are colored blue and the
multiples of 7 are colored black. Which number will be the first one to be colored
blue and black?
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
4. Train A leaves the station every 4 minutes and train B leaves the station every 9
minutes. Both trains leave at 10:00 a.m. What will be the next time at which both
trains leave the station at the same time?
3. In the number chart shown below, the multiples of 3 are colored blue and the
multiples of 7 are colored black. Which number will be the first one to be colored
blue and black?
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
4. Train A leaves the station every 4 minutes and train B leaves the station every 9
minutes. Both trains leave at 10:00 a.m. What will be the next time at which both
trains leave the station at the same time?
