Fifteen years from now Ravi’s age will be four times his present age. What is Ravi’s present age?
solution of this question
Solution:
Let the present age of Ravi be x years.
After 15 years, his age will be = (x + 15) years
As per the conditions, we get
⇒ x + 15 = 4x
⇒ 15 = 4x – x (transposing x to RHS)
⇒ 15 = 3x
⇒ 15 ÷ 3 = x (transposing 3 to LHS)
⇒ x = 5
Hence, the present age of Ravi = 5 years.
Answers
Step-by-step explanation:
General Methods of Preparation of Haloalkanes
1. From Alcohols
In Groove’s method, ZnC12 is used to weaken the C-OH bond. In case of 3° alcohols, ZnC12 is not required.
The reactivity order of halogen acids is HI > HBr > HCl.
Darzen procedure is the best method for preparing alkyl halides from alcohols since both the by products (SO2 and HCl) are gaseous and escape easily.
Answer:
5 years
Step-by-step explanation:
Let Ravi’s present age be x years.
After fifteen years, Ravi’s age = 4x years.
Fifteen years from now, Ravi’s age = (x+15) years.
According to question, 4x = x + 15
\Rightarrow\ 4x-x=15⇒ 4x−x=15
[Transposing x to L.H.S]
3x = 15
\Rightarrow\ \frac{3x}{3}=\frac{15}{3}⇒
3
3x
=
3
15
[Dividing both sides by 3]
x = 5 years.
Hence, Ravi’s present age be 5 years.