109521ab is divisible by 22. Which of these is a possible value of a and b & HOW????
2007-05-16 03:14:35 · 6 answers · asked by viv 1 in Science & Mathematics ➔ Mathematics
options r
a) 60
b) 54
c) 39
d) 06
2007-05-16 03:22:32 · update #1
There is a rule for divisibility by 11: n is divisible by 11 if and
only if the sum of the digits in the odd numbered
places - the sum of the digits in the even numbered
places is a multiple of 11.
So let's apply this rule here:
Odd numbered places: 1+9+2+a = 12+a
Even numbered places: 0+5+1+b = 6+b
Difference: 6+a-b.
Since your number is divisible by 2 as well
as 11 it must be even.
So the answer is d). 06.
2007-05-16 03:58:38 · answer #1 · answered by steiner1745 7 · 0⤊ 0⤋
I'm not good at math but isn't your problem also stated,
The result of 109521 x a x b, is divisible by 22. That would mean a x b = 22. So the best whole number answer would be 11 and 2.
What you think?
dividing 109521 by 22 = 4978.227273 That doesn't look good. but then like I said I'mnot good at math.
2007-05-16 10:26:45 · answer #2 · answered by Caretaker 7 · 0⤊ 1⤋
d - 06 (10952106/22 = 497823)
Just divide the number by 22 and if it doesn't have a remainder you have your answer.
2007-05-16 10:25:18 · answer #3 · answered by Karen 3 · 0⤊ 0⤋
Which of these what?
At least make an attempt....geez.
2007-05-16 10:22:58 · answer #4 · answered by guinnesscrazy 3 · 0⤊ 1⤋
lol do you're own damn homework and read your notes!
2007-05-16 10:21:46 · answer #5 · answered by thatonefriend1 2 · 0⤊ 1⤋
All of "these" but none of "those"
2007-05-16 10:19:49 · answer #6 · answered by Poetland 6 · 0⤊ 1⤋