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25 Nov 2019, 23:45
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E
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Difficulty:
65%
(hard)
Question Stats:
67% (02:51) correct
33%
(02:56)
wrong
based on 254
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The ratio of a two-digit positive integer to a number formed by reversing its digits is 4:7. Which of the following is the sum of all the numbers of all such pairs?
A. 99
B. 132
C. 198
D. 282
E. 330
Are You Up For the Challenge: 700 Level Questions
A. 99
B. 132
C. 198
D. 282
E. 330
Are You Up For the Challenge: 700 Level Questions
26 Nov 2019, 00:03
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given
(10a+b)/(10b+a)= 4/7
we get
2a=b
so
value of integers ( 12,21) ( 24,42) ( 36,63) ( 48,84)
total sum of all integers = 330
IMO E
(10a+b)/(10b+a)= 4/7
we get
2a=b
so
value of integers ( 12,21) ( 24,42) ( 36,63) ( 48,84)
total sum of all integers = 330
IMO E
Bunuel
09 Oct 2024, 01:14
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Archit3110
Can you please explain the highlighted step?
