There is a two-digit number whose units digit is 6 less than the tens digit. Four times the tens digit plus five times the units digit equals 51. Find the digits.
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Answer:
let the tens digit is x
then unit digit is x-6
again , 4x+5(x-6)=51
=> 4x+5x-30=51
=> 9x=51+30
=> 9x=81
=> x=81/9
=> x=9
so , tens digit is 9 and unit digit is 9-6=3
so the number is 93
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