Jan is one year younger than her brother bill and one year older than her sister sue. the sum of the three children's age is 57. how old is each child?

Jan is 19yrs old, Bill is 20yrs old and Sue is 18yrs old

Step-by-step explanation:

Let Jan = x

Bill = x + 1 (older than Jan)

Sue = x - 1 (younger than

Jan)

3 children = 57

x+x+1+x-1 = 57

3x = 57

x = 19

Bill -> 19 + 1 =20yrs

Sue -> 19 - 1 = 18yrs