A construction company wants to number new houses using digit plates only. If the company puts an order for 522 plates, how many houses are to be given numbers? (The numbers of houses are consecutive and the number of the first house is 1). Choose the correct choice from the following answers:
A) 220
B) 230
C) 210
D) 240
E) 250
You know that the answer is going to be three digits, and it's easy to figure out how many 1 and 2 digit numbers (9 and 90), so the real question is how many 3 digit number are there?   99+(522-9-90*2)/3= 
<gadget id="calculator">99+(522-9-90*2)/3</gadget>
<output>210</output>
210   Answer : 210
<result>C</result>
A construction company wants to number new houses using digit plates only. If the company puts an order for 522 plates, how many houses are to be given numbers? (The numbers of houses are consecutive and the number of the first house is 1).