Page 66 - NUMINO Challenge_A2
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Problem solving
1 A snail fell into a well that is 24 m deep. The snail Key Points
climbs 8 m up the well during the day, but slides 4
m down when it sleeps at night. How many days The snail can only
will this snail take to get out of the well? get out of the well
when it climbs up
the well during the
day.
2 Sarah put a magic germ inside a bottle, and the 1 germ must fill half
bottle was completely filled with gems in 8 hours. the bottle such that
The number of germ increases by a multiple of 2 2 germs fill the
every hour. If she puts two germs into the bottle, bottle.
how many hours will it take for the bottle to be
completely filled with germs?
63Communication
1 A snail fell into a well that is 24 m deep. The snail Key Points
climbs 8 m up the well during the day, but slides 4
m down when it sleeps at night. How many days The snail can only
will this snail take to get out of the well? get out of the well
when it climbs up
the well during the
day.
2 Sarah put a magic germ inside a bottle, and the 1 germ must fill half
bottle was completely filled with gems in 8 hours. the bottle such that
The number of germ increases by a multiple of 2 2 germs fill the
every hour. If she puts two germs into the bottle, bottle.
how many hours will it take for the bottle to be
completely filled with germs?
63Communication
