Calculate A*B-C-D
Look at the series (7, 4, 5, 12, 45, D, 1329, 9300, 74397, C, B, A, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A*B-C-D!Correct answers: 19
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math
Welfare Office
A woman went down to the Welfare Office to get aid.
The office worker asked her, "How many children do you have?"
"Ten," she replied.
"What are their names?" he asked.
"David, David, David, David, David, David, David, David, David and David," she answered.
"They're all named David?" he asked "What if you want them to come in from playing outside?"
"Oh, that's easy," she said. "I just call 'David,' and they all come running in."
"And, if you want them to come to the table for dinner?"
"I just say, 'David, come eat your dinner'," she answered.
"But what if you just want ONE of them to do something?" he asked.
"Oh, that's easy," she said. "I just use their last name!"