Question

The sum of present ages of Timothy and Sarah is 40 years ,Timothy is elder than Sarah by 20 years. Find their present ages ?
Use simultaneous equation 

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Answer 1

Answer:

Step-by-step explanation:

Let the age of Timothy be x

Sarah=y

X+y = 40

X=40-y

X = y+20

40-y = y+20

40-20 = 2y

20=2y

Y=10

X= y+20

=10+20 = 30

Timothy = 30years

Sarah=10years

Answer 2

let the Timothy age be x+y (equation 1)
and Sarah age be x-y (equation 2)

now,
we will add both equation
x+y+x-y=40
2x=40
x=20
Timothy present age
x+y=40
20+y=40
y=20
so,
x+y=40
sarah present age
x-y=40
20-y =40
y=40-20
y=20
so,
x-y=20

there is your answer