none, as that 400 has only 4 and 0
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In 5420, you have:5 x thousand; 4 x hundred; 2 x tens; zero x ones (the American ones in math is known as units in British maths!).
4,448
It is 9326.
Oh, dude, that's like a math riddle straight out of a textbook. So, let's break it down: if we have twice as many thousands as ones, that means the thousands digit has to be 8 (since 8x2=16). Then, twice as many ones as hundreds means the ones digit is 2 (since 2x2=4). And finally, twice as many hundreds as tens means the hundreds digit is 4 (since 4x2=8). So, the number is 8422. Math can be fun, right?
There are 0.06 of them.