Ababysitter is trying to determine the ages of three children: jerome, keenan, and leitha. she knows the following facts about their ages: the sum of jerome’s and keenan’s ages is 18 years; the sum of jerome’s and leitha’s ages is 19 years; and the sum of keenan’s and leitha’s ages is 21 years. how old is keenan?

10 years.

Step-by-step explanation:

Let Jerome, Keenan, and Leitha have ages of x,y and z respectively,.

Then given that x+y =18  ... i

                           x+z =19  ... ii

                           y+z = 21 ... iii

From the above information we are to find out y and i.e.Keenan age.

Add all the 3 equations

Left side becomes x+y+y+z+z+x = 2(x+y+z)

and right side becomes = 18+19+21 = 58

In other words, 2(x+y+z) = 58

Divide by 2

x+y+z =29  ... iv

From the equation iv subtract ii

x+z =19

We get y = 10

Hence Kennan age = 10 years

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72