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CTET 2 Math and Science Sep 2014 Paper
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© examsnet.com
Question : 40
Total: 120
The hundreds digit of a three-digit number is 7 more than the units digit. The digits of the number are reversed, and the resulting number is subtracted from the original three – digit number. The units digit of the final number so obtained is
0
1
2
3
Validate
Solution:
Let unit digit be x
Then, hundreds digit
=
x
+
7
Number
=
100
(
x
+
7
)
+
x
=
101
x
+
700
Now, after reverse the new number will be
=
100
x
+
x
+
7
=
101
x
+
7
According to question
Original number – New number
=
(
101
x
+
700
)
−
(
101
x
+
7
)
=
693
So, unit of final number = 3.
© examsnet.com
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