Răspuns :
27 - ( n × 24 + 1 ) : 7 = 20
( n × 24 + 1) : 7 = 27 - 20
( n × 24 + 1) : 7 = 7
( n × 24 + 1 ) = 7 × 7
( n × 24 + 1 ) = 49
n × 24 = 49 - 1
n × 24 = 48
n = 48 : 24
n = 2
27 - ( n × 24 + 1 ) : 7 = 20
( n × 24 + 1) : 7 = 27 - 20
( n × 24 + 1) : 7 = 7
( n × 24 + 1 ) = 7 × 7
( n × 24 + 1 ) = 49
n × 24 = 49 - 1
n × 24 = 48
n = 48 : 24
n = 2