Answer = 20
Let the number be ab where a is the "tens" value and b is the "units" value.
Then a + 4 = 3(a + b)
a + 4 = 3a + 3b
4 = 2a + 3b
The only condition that satisfies this is when b = 0 then 4 = 2a : a = 2
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
The largest three digit prime number whose digits are all primes is 773.
It is 58.
1
There is no number. 100 is the only one that has a hundreds digit. It's impossible.
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
Find a four digit number whose digits will be reversed when multiplied by nine?
The largest three digit prime number whose digits are all primes is 773.
It is 58.
1
There is no number. 100 is the only one that has a hundreds digit. It's impossible.
279,999,720
992
111111
7777
940
What is the units digit of the least whole number greater than 1000 whose digits are all different?