Question

A new colony was built and the builder gave contract to sign maker to no. the buildings from no. 1 to 500. How many zeroes will he need.

Answer 1

Solution :-

From 10 to 100
= 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 = 11 zeros 

From 101 to 110 
= 101, 102, 103, 104, 105, 106, 107, 108, 109 and 110 = 10 zeros

From 120 to 200
= 120, 130, 140, 150, 160, 170, 180, 190 and 200 = 10 zeros

Similarly, From 201 to 210
= 10 zeros

From 220 to 300
= 10 zeros

From 301 to 310
= 10 zeros

From 320 to 400
= 10 zeros

From 401 to 410
= 10 zeros

From 420 to 500
= 10 zeros
 
Total number of zeros will be needed = 11 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 
= 91 Zeros

So, total 91 zeros will be required. 

Answer.