mangamma wrote:
N=abc, N with hundreds digit a, tens digit b and units digit c. If a+b+c=20, what is the value of b?
(1) The product of digits a and c is 18.
(2) b/c=1 and b>a
Kudos for each explanation
(1) The product of digits a and c is 18.
the one-digit factor pairs for 18 are (2,9) or (3,6),
if (3,6) then b = 20 - 9 = 11 which is not valid because it should be one digit
if (3,6) then b = 20 - 11 = 9 #sufficient
(2) b/c=1 and b>a
it means a < b = c
the combinations can be (2,9,9), (4,8,8), (6,7,7)
no definite value #insufficient
so A
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