Question

thr sum of three numbers is 15/2.if two of them are 7/12 and 11/18.find the third

Answer 1

Let the three numbers be x,y, z.

Acc. to question,
the sum should be
x+y+z = 15/2

Let x and y be the two of them,
x = 7/12
y = 11/18

Therefore, x+y+z = 15/2
7/12 + 11/18 + z = 15/2

z = 15/2 - 7/12 - 11/18
So, z = 227/36
Hope this helps you.

Answer 2

given:

x=7/12

y=11/18

x+y+z=15/2

7/12+11/18+z=15/2

21+22/36+z=5/12

43/36+z=5/12

z=5/12-43/36

z=15-43/36

z=-28/36

z=-14/18

z=-7/9