okay...so there is this math problem thats worth 20 Extra points...its like this... XX over XXX(its a fraction) +XX over XX(this is also a fraction) must = 7 ..... u have 2 use numbers 1-9 only once....?whats the answer...i spent 2 days and i still dont know the answer:(
2006-12-23 08:48:36 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
if all the numerators and denominators are two digit numbers
then
92/46+85/17=7
if as it were
one digit on the left must be 7
so 7 will be used two times.
97/582+41/6=7
check the number of Xs in the question
2006-12-23 09:45:43 · answer #1 · answered by iyiogrenci 6 · 1⤊ 0⤋
OK, let me think about it a little.
First thing I notice:
the first fraction is a 2-digit number over a 3-digit number, so it MUST be less than 1.
Therefore the second fraction must be greater than 6 but less than 7.
So the first number on the bottom of the second fraction has to be the 1, and the first number on the top of the second fraction has to be 6 or greater.
Also we want to make sure that the denominator of the second fraction is a factor of the denominator of the first fraction so that we can add them easily...and that the numerator of the first fraction has factors in common with its denominator so it will reduce.
Still working, updating as I think of stuff....
OK well looks like knock knock got it:
95/247 + 86/13
I was trying to reason it out logically, but I had gotten to the point where trial and error was the only solution, and I guess he beat me to it.
2006-12-23 08:56:11 · answer #2 · answered by Jim Burnell 6 · 3⤊ 0⤋
8/2 + 9/3 = 7
4/1 + 6/2 = 7
2006-12-23 08:51:10 · answer #3 · answered by Thomas K 6 · 1⤊ 1⤋
95/247 + 86/13
Trial and error is the only way. I cheated by brute forcing it >>
2006-12-23 09:17:48 · answer #4 · answered by knock knock 3 · 1⤊ 0⤋
Well I agree with some people U should ask the teacher.
2006-12-23 08:54:48 · answer #5 · answered by historyman_of_sa 4 · 0⤊ 0⤋
You need to better describe the problem.
2006-12-23 08:51:51 · answer #6 · answered by modulo_function 7 · 1⤊ 0⤋
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2006-12-23 09:54:54 · answer #7 · answered by true fashion girl 2 · 0⤊ 3⤋
....I do NOT know....sorry =) I think your teachers Are just trying to give you stress or just tricking you...
2006-12-23 08:50:28 · answer #8 · answered by Anonymous · 0⤊ 3⤋
sorry i don't know.i will help you next time.
2006-12-23 10:41:19 · answer #9 · answered by Jeanette S 1 · 0⤊ 3⤋