Easy but tricky try it pls 4 me.......what is the ans's?

[itsammy003]

A printer numbers the pages of book starting with 1 and uses 639 digits

a) the number of pages in the book b)250

which one is greater ?how?

[lime]

Let x be number of pages. Then

(x - 90 - 9)*3 + 90*2 + 9= 639

which gives

x = 249.

B.

[ramaricon]

for 250 pages
9 + 90*2 + 151*3 =642 digits >639. so b is the answer

[mathewdavid]

I agree with all.
answer is B.

[honeykrithi]

Number of one-digit pages from 1 to 9 = 9Number of two digit pages from 10 to 99 = 90Number of three digit pages =x
Total number of required figures 9 * 1 + 90* 2 + x * 3 = 639
==>639-189/3 = x
=150 <250
So, the answer is B