seven times a two digit number is equal to four times the number obtained by reversing the order of its digit . if the difference of the digit is 3 . determine the number .
[Solve it by cross multiplication method only].
Question for class 10.
it's very urgent plzzz answer me.
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Answer:
12
Step-by-step explanation:
let the no. in tens digit be x
therefore no. in ones digit 3-x
And the no.=10x + 3-x
According to the question,
7 ( 10x + 3-x ) = 4 ( 10 ( 3-x ) + x)
70x +21 - 7x = 4 ( 30 - 10x + x)
70x +21 - 7x = 4 ( 30 - 9x )
63x + 21 = 120 - 36x
63x + 21 = 120 - 21
99x = 99
x = 99/99
x = 1
The digit in ones place is 3-x = 2
The digit in tens place is x = 1
The no. = 12
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