Oman is a country and located in Middle East.
The capital of Oman is Muscat.

Suppose,
Age of 3 Boys=3x+5x and 7z
According to Questions:
(3x+5x+7y)/3=15
15x/3=15
15x=15*3
15x=45
x=45/15
x=3
According to Question, the age of younger boys=3x
3x=3(3)=9

James Clear was a Speaker and Writer focused on Habits, Decision Making and Continous Improvement.
He wrote for New York Times.
The book “Atomic Habits” has became most famous and sold over 10 million copies worldwide.
This book has been translated more than 50 languages.

ICRC won the Nobel Peace Prize in 1917, 1944 and 1963.

The currency of Australia is Dollar.

WWI stands for World War 1.
WWI is also known as Great War.
WWI was started on 28 July 1914 and ended on 11 November 1918.
In 1917, Germany destroyed the Passengers and Merchant Ships & Wilson decided to lead US into WWI.

Brexit means “Britain Exit from EU”.
The summit meeting of EU member countries about Brexit was held in Brussels, Belgium in February 2016.

Sum of Two Ratios=3+4=7
Sum of Numbers=63
First Number=3/7*63=27
Second Number=4/7*63=36
Therefore, two numbers are 27 and 36.

The Secretary General of UN may be re-appointed for second five years term.
The Article 97 of UN Charter discusses about the appointment of UN Security General.

This boundary line was established on the name of British Secretary Henry MCMahon in 1916.
The length of this bounday is 550 Miles or 890 Km.