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13 Dec 2021, 03:15
Kudos
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B
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Difficulty:
55%
(hard)
Question Stats:
61% (02:01) correct
39%
(02:03)
wrong
based on 108
sessions
History
Date
Time
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Not Attempted Yet
When you reverse the digits of the number 13, the number increases by 18. How many more two digit numbers increase by 18 when their digits are reversed?
A. 8
B. 6
C. 5
D. 4
E. 3
A. 8
B. 6
C. 5
D. 4
E. 3
13 Dec 2021, 05:20
Kudos
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Given: When you reverse the digits of the number 13, the number increases by 18.
Asked: How many more two digit numbers increase by 18 when their digits are reversed?
Let the number be xy where x is tenth digit and y is unit digit.
Number = 10x + y
Number with digit reversed = 10y + x
(10y +x) - (10x +y) = 9(y-x) = 18
y-x = 2
Numbers = {13,24,35,46,57,68,79}
IMO B
Posted from my mobile device
Asked: How many more two digit numbers increase by 18 when their digits are reversed?
Let the number be xy where x is tenth digit and y is unit digit.
Number = 10x + y
Number with digit reversed = 10y + x
(10y +x) - (10x +y) = 9(y-x) = 18
y-x = 2
Numbers = {13,24,35,46,57,68,79}
IMO B
Posted from my mobile device
02 Feb 2023, 14:36
Kudos
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