Answer :
$140 = $6 per book • x books + $50
Subtract $50 from $140 and you get:
$90 = $6 per book • x books
Divide $90 by $6 per book:
And you get x = 15 books
Subtract $50 from $140 and you get:
$90 = $6 per book • x books
Divide $90 by $6 per book:
And you get x = 15 books
Answer:
the basic wage is 50$
the extra to get 140$ is 90$(140-50)
.............
as for 1 book he get 6$
so for ? book he get 90$
then ? =(90$*1)/6$= 15 book
that's it hope i helped.