80
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The number must be in the range of 781 to 799. To have 8 more tens than ones, the number must have a tens digit of 8 and a ones digit of 0. Therefore, the number is 780.
380
The number you are looking for is 74.
The number that has 3 tens and 8 ones is 38. In the decimal system, each digit's place value increases by a factor of 10 from right to left. Therefore, the digit in the tens place represents the number of tens (3), and the digit in the ones place represents the number of ones (8).
3 more than 5 is 8, so the tens digit is 8. The tens digit is,double the number of the ones digit, so divide 8 by 2 and you get 4. If you double 4 it is 8 so, the number is 84.