Explanation

About ICC Men’s Cricket ODI World Cup 2019 Edition: 12th

World Cup 2019 Venue: Wales & England

Most wickets taken by: Mitchell Starc (Australia)

Champion: England (first time) 

Runner-Up of World Cup 2019: New Zealand

Participating teams: 10

Matches played: 48

Player of the series: Kane Williamson (New Zealand)

Most runs taken by: Rohit Sharma (India)

Explanation

Find the value of "a"

a + 4 = 10 

a = 10 - 4 

a = 6 

__

Find the value of "b"

b + 10 = 4 

b = 4 - 10 

b = - 6 

find :

a + b = 6 + ( - 6)

= 6 - 6 

= 0