Question 1116104
Write an equation for each statement
:
Chris has two children,Beth and Amy
b and a
Beth is 10 years older than Amy
b = a + 10
Chris says 'I am twice as old as the sum of Beths age and Amys age
c = 2(a+b)
Chris is 40 years old
2(a + b) = 40
divide both sides by 2
 a + b = 20
How old is amy
replace b with (a+10) from the 2nd statement 
a + (a+10) = 20
2a = 20 - 10
2a = 10
a = 10/2
a = 5 yrs is Amy's age
:
:
Check in the statement b = 5 + 10
"Chris says 'I am twice as old as the sum of Beths age and Amys age 
2(5 + 15) = 40