Question

A particular computer takes 43 nanoseconds to carry out five sums and seven products. It takes 36 nanoseconds to carry out four sums and six products. How long does the computer take to carry out one sum?

Answer 1

A) 5s + 7p = 43 nanoseconds
B) 4s + 6p = 36 nanoseconds
Multiply equation A) by 4 and equation B) by -5

A) 20s + 28p = 172
B) -20s -30p = -180  Adding both equations
-2p = -8
EACH product requires 4 nanseconds

Computing SUM
A) 20s + 28*4 = 172
A) 20s + 112 = 172
A) 20s = 60
SUM = 3 nanosecond