Subject :IMO Class : Class 8
A three digit number has (2x+1) as its hundreds digit, (x−1) as its tens digit and x as its units digit. The three digit number, in terms of x, is
A2x3 − x2 − x
B211x + 90
C211 + 90x
D211x 2 + 90x
option b is not correct. why?
Ans 1:
Class : Class 8
it will be b only
Ans 2:
Class : Class 8
Yes ,I also have felt some answers given in this site are wrong.
Ans 3:
Class : Class 8
I agree,
hundred's digit place value is 100
ten's digit place value=10
unit's place=1
2x+1= 100 x (2x+1) = 200x + 100
x-1= 10 x (x-1) = 10x - 10
x= x x 1 = 1x
thus the number = 200x +10 x + 1x +100 -10
= 211x +90.