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The sum of the digits of a certain two-digit number is 7. Reversing it
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31 Jul 2022, 04:41
31 Jul 2022, 04:41
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Question Stats:
84% (01:06) correct
15% (00:56) wrong based on 19 sessions
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The sum of the digits of a certain two-digit number is 7. Reversing its digits creates a second number which is larger than the first by 9. The first number is
I 43
II 25
III 34
A I only
B I and II only
C II and III only
D III only
E I and III only
I 43
II 25
III 34
A I only
B I and II only
C II and III only
D III only
E I and III only
Part of the project: GRE QCQ & PS 3 Questions Every One DAILY Challenge - (2022)
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GRE Math Essentials (2022)
GRE Geometry Formulas for a Q170
GRE - Math Book
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GRE Math Essentials (2022)
GRE Geometry Formulas for a Q170
GRE - Math Book
Re: The sum of the digits of a certain two-digit number is 7. Reversing it
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10 Aug 2022, 07:35
10 Aug 2022, 07:35
Expert Reply
Re: The sum of the digits of a certain two-digit number is 7. Reversing it
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30 Apr 2025, 03:07
30 Apr 2025, 03:07
1
x+y=7 ---(1)
10y+x=10x+y+9
10y−y=10x−x+9
9y=9x+9
Divide both sides by 9:
y=x+1. ---(2)
From (2) & (1),
x = 3, y=4
Ans = 34
10y+x=10x+y+9
10y−y=10x−x+9
9y=9x+9
Divide both sides by 9:
y=x+1. ---(2)
From (2) & (1),
x = 3, y=4
Ans = 34
