|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
2. One of the 7 numbers that you will
see must be eliminated because it doesn't respect the rule. What is the
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.
"Duiliu Zamfirescu" School, Focsani,
Teacher: Petru Dumitru