In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Q: Problem: a number whose fifth part increased by 7 is equal to its fourth part diminished by 7 is ? 
Options: a ) 160 , b ) 180 , c ) 200 , d ) 280 , e ) none

A: d
****
Q: Problem: 120 + 520 ÷ 5.00 = ? 
Options: a ) 100 , b ) 150 , c ) 120 , d ) 520 , e ) none

A: e
****
Q: Problem: if x + y = 24 , x - y = 40 , for integers of x and y , x = ? 
Options: a ) 20 , b ) 23 , c ) 25 , d ) 32 , e ) 42

A:
d
****