College word problem

Question

A company operates on two types of servers: 2 large servers (L) and 4 smaller servers (S), with a combined total of 100GB RAM. Recently a large server and a small server blew out, reducing the total RAM to 60GB. How much RAM does each large server (L), and each small server (S) have?

L=30, S=10L=24, S=13L=20, S=15

Answer 1

2L+4S=100.........eq1

L+3S=60.............eq2

L=60-3S

Substituting for L in eq1 we have

2(60-3S)+4S=100

120-6S+4S=100

-2S=-20

S=10

L=60-3S=60-3(10)=60-30=30

L=30GB

S=10GB