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