Please help q02 A certain computer can execute 100 gigaflops

Please help (q02)

A certain computer can execute 100 gigaflops per second. Find the time required to solve a system of 1000 equations in 1000 unknowns, using Gauss-Jordan elimination. Give your answer to 4 significant figures.

Solution

Number of equations and number of unknowns = 1000

Number of giga flops for forward phase = 2/3 * (1000)^3 * 10^(-3) = 2/3

Number of gigaflops for backward phase = (1000)^2 * 10^(-9) = 0.001

Time taken = (2/3 + 0.001)/100 = 0.00667 seconds