Question

In some countries congress, the number of representatives is 80 less than 5 times the number of senators. there are a total of 520 members. find the number of senators and the number representatives

Answer 1

s + r = 520
r = 5s - 80

s + (5s - 80) = 520
6s - 80 = 520
6s = 520 + 80
6s = 600
s = 600/6
s = 100 <=== senators

r = 5s - 80
r = 5(100) - 80
r = 500 - 80
5 = 420 <=== representatives