BRAIN TEASERS

# Find number abc

If 20b6c + a2a4c = 33aa4 find number abc. Multiple solutions may exist.
The first user who solved this task is Nasrin 24 T.
#brainteasers #math

### A vampire bat came flapping in...

A vampire bat came flapping in from the night covered in fresh blood and parked himself on the roof of the cave to get some sleep.

Pretty soon all the other bats smelled the blood and began hassling him about where he got it.

He told them to go away and let him get some sleep but they persisted until finally he gave in.

"OK, follow me" he said and flew out of the cave with hundreds of bats behind him.

Down through the valley they went, across a river and into a forest full of trees.

Finally he slowed down and all the other bats excitedly milled around him.

"Now, do you see that tree over there?" he asked.

"Yes, Yes, Yes!" the bats all screamed in a frenzy.

"Good" said the bat, "Because I sure didn't!"
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### Chinese H-bomb

In 1967, China tested its first hydrogen bomb. This was China's sixth nuclear test, and its first full scale radiation implosion (Teller-Ulam) weapon test. The device contained U-235, lithium-6 deuteride, and U-238. It was detonated at 2960 m over the Lop Nur Test Ground after being dropped from an airplane, and had a yield of 3.3 megatons. (It was conducted only 32 months after Chinas's first atomic test, 16 Oct 1964, the shortest elapsed time for any nuclear weapons state. The country's first test was an atomic bomb, a pure-fission U-235 implosion fission device named "596." That device weighed 1550 kg with a 22 kiloton yield. No plutonium was available at the time of this first bomb was tested.)
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