allisonore12 allisonore12

04-01-2019
Mathematics

contestada

If I write one digit per second, how long will it take me to write out all the numbers from 1 to 1989?

HOW LONG PLEASE :

A) 33 min 9 sec
B)1 h 22 min 39 sec
3)1 h 54 min
D) 1 h 54 min 9 sec
E) 2 h 12 min 9 sec

I HAVE AN EXAM ON SAT, AVERAGE IS 1 MIN 30 SEC FOR EACH QUESTION SO I NEED TO KNOW HOW TO DO THIS QUICKLY PLEEEASE.

Respuesta :

mathecoach mathecoach

04-01-2019

Answer:

1 - 9: 9 digits

10 - 99: 90*2 = 180 digits

100 - 999: 900*3 = 2700 digits

1000 - 1989: 990*4 = 3960 digits

This makes 6849 digits or 6849 seconds

D) 1 h 54 min 9 sec

Answer Link

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