Eight hundred and twenty-four
abc
c=1/2a
b=1/2c
So
lowest is b so start with b=1
412 = 7
now make b=2
824 = 14
423
the answer for that is 18 1+8=9 18/2=9
84.42 or 42.21
Well, isn't that a happy little mystery we have here, friend! Let's think about this together. Since the number is greater than 50 and has two digits, we can deduce that the number is 75. One digit is 5 and the other digit is half of 5, which is 2.5, but since we can't have a half digit, we round it up to 3. So Dan found the number 53.
To find the fraction of 4-digit natural numbers with a product of their digits that is even, we first need to determine the total number of 4-digit natural numbers. There are 9000 such numbers (from 1000 to 9999). Next, we consider the conditions for the product of digits to be even. For a number to have an even product of digits, at least one of the digits must be even. There are 5 even digits (0, 2, 4, 6, 8) and 5 odd digits (1, 3, 5, 7, 9). Therefore, the fraction of 4-digit natural numbers with an even product of digits is 5/10 * 9/10 * 9/10 * 9/10 = 3645/9000 = 809/2000.
423
I think the answer is 612!1 (tens digit) which is odd is half of 2 (hundreds digit) and the sum is (6+1+2=9).
423
Well, isn't that just a happy little mystery we have here! Let's take a closer look at our clues. If the tens digit is half the hundreds digit and the sum of the digits is 9, we can see that the hundreds digit must be 6, the tens digit is 3, and the units digit is 0. So the missing number X is 630. Happy solving, my friend!
3221
by making them half
Truncation is an operation whereby a long decimal representation of a number is stopped after a given number of digits, taking no account of the digit which follows. This is different from rounding where the final digit retained may be increased by 1 if the following digits make a number which is greater than half a unit.
421 and 842
It is 875.It can be 875 or 885. Using the round-half-to-even method, as required by IEEE Standard 754, both would be rounded to 880.
the answer for that is 18 1+8=9 18/2=9
Eleven 1 + 1 = 2 1 x 1 = 1
42.21 or 84.42