\[\square6 + \square7 = 1\square3\] All three boxes contain the same digit. What digit belongs in the boxes to make this equation true?
This is an arithmetic puzzle, where \( 1 \square \) would represent the 2-digit number 19 if \( \square = 9 \). It does not represent the algebraic expression \( 1 \times \square \).
I am thinking of a three digit number. The product of the digits in my number is 14, and the last digit is twice as big as the first digit.
What number am I thinking of?
A certain five-digit number has the property that if the digit 1 is placed (concatenated) at the end of the number, the result is three times larger than if the digit 1 is placed at the beginning of the number.
What number is it?
What operation goes into the red square?
What digit does the letter F represent?