Question

mary is twice older than her sister.In 5years time,she will be 2years older than her sister.Find how old are they both now​

Answer 1

Answer:

Mary is 4 years old and her sister is 2 years old.

Step-by-step explanation:

Let age of mary =m

Let age of her sister =s

Given that, m=2s

After 5 years, mary will be 2 years older than her sister.

(m+5)=(s+5)+2

∴m=s+2

m=2s⇒s+2=2s⇒s=2

∴m=4

Mary is 4 years old and her sister is 2 years old.

Answer 2

Answer:

Let age of mary =m

Let age of her sister =s

Given that, m=2s

After 5 years, mary will be 2 years older than her sister.

(m+5)=(s+5)+2

∴m=s+2

m=2s⇒s+2=2s⇒s=2

∴m=4

Mary is 4 years old and her sister is 2 years old.