| 1. A tractor doubles its ploughed
surface of field every day. In how many days will the tractor finish the
field if after 6 days of work it finished half of it?
After 7 days because if in the 6th
day it ploughed half of the field, in the next day, working double it will
finish it.
Ionut Trif,
5th grade
2. One of the 7 numbers that you will
see must be eliminated because it doesn't respect the rule. What is the
number?
83; 73; 69; 12; 96; 37; 38.
12 because the other numbers are
written "in mirror"!
3. Grandpa has 7 kg of grain and
for a weighing he has a 1 kg weight. How can grandpa separate 3 kg of grain
using only one weighing?
He balances the scales with the grain
that he has, putting the 1 kg weight on one of the scales.
4. A snail climbs on a tree 3 m every
day and it slides 2 m at night. How many days does it need for climbing
the top of the 10 m tall tree?
It needs 8 days because the last
day it doesn't slide any more.
Catalina Stoica,
5th grade
"Duiliu Zamfirescu" School, Focsani,
Romania
Teacher: Petru Dumitru
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