algebra
posted by mutaz on .
A number consists of two digits. The sum of twice the tens digit an 5 times the units digit is 19. If the digits are reversed, the new number is 54 less than the original number. Find the number

let the number be MN digits,
2M+5N=19
10N+M+54=10M+N
2M+5N=19
9N9M=54
check those equations.