Question

5. Dana's age is four less than 3 times Jing's age. If Dana is11,
how old is Jing?​

Answer 1

Answer:

Age of Jing = 21 years

Step-by-step explanation:

Given :

Dana's age is four less then three time of Jing's age

Dana age = 11 years

To find :

Jing's age or how old Jing is

Taken :

Let the age of Jing be x

To find the age of Jing use this formula -:

$\boxed{\tt{\dfrac{x}{3}+4=11}}$

Where,

J = Jing's age

D = Dana's age

Solution :

$\implies\tt{\dfrac{x}{3}+4=11}$

$\implies\tt{\dfrac{x}{3}=11-4}$

$\implies\tt{\dfrac{x}{3}=7}$

Now , cross multiply the number

$\implies\tt{x=7\times3}$

$\implies\tt{x=21years}$

So , the age of Jing is 21 years .