Mathematics
Jasminewillaims
2020-04-28 10:58:30
The sum of a two-digit number is 15. When the digits of the two-digit number are reversed, the new number is 9 more than the original number. What is the original number?
ANSWERS
shefali1616
2020-04-28 17:51:04

78       reverse the numbers to get 87

conejsuarez
2020-04-28 17:52:19

The original number is 10x+y  x is the ten digit and y is the one digit  Sum : x+y=15 y=15-x(substitution)   Digit reversed: 10y+x -- , now the ones is the tens and the tens is the ones. 10(15-x)+x=10x+15-x-27 150-9x=9x-12 -18x= -162 y= 15-9 y=6   the 2 digit number is 96.9 --> 10 digit and 6 --> one digit  The numbers are 9 and 6 96 - 69 = 27

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