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Gnesinka [82]
4 years ago
6

Find the greatest number that will divide 43,91,183 so as to leave the same remainder in each case

Mathematics
1 answer:
Ludmilka [50]4 years ago
3 0

Answer:

It is 4.

Step-by-step explanation:

If x is the greatest number  and b  the remainder the we have the equations:

ax + b = 183

cx + b = 91

dx + b = 43    where a,c and d are whole  numbers.

Subtracting  the last equation from the first:

ax - dx = 140

x (a - d) = 140

So x must be a factor of 140.

140 = 2 * 2 * 5 * 7

Trial and error:

Let  x = 35 :

43 / 35: remainder  is 8

91 / 35 : rem = 21    So NOT 35.

x = 7:  43/7 rem = 1

           91 / 7 rem = 0  So NOT 7.

x = 5:  43/5  rem = 3, 91/5 rem = 1 ,  NOT 5.

x = 10  43/10 rem 3, 91/10 rem 1 NOT 10.

x = 20  43/20 rem 3, 91/20 rem 11 so NOT 20.

x = 28 43/28 rem 15, 91/28 rem 7 so NOT 28.

x = 14: 43 / 14  rem =1,  91/14 rem =  7  NOT 14.

x = 4:   43/4 rem 3, 91/4 rem 3, 183 / 4 rem 3. So it is 4.

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