Examples - Processor Utilisation

A system with three periodic tasks with period and its execution time T1 (3, 1) T2 (5, 2) and T3 (7, x). What is the value of x if the system uses the processor for 95% of the time?

Processor Utilisation Factor is given by

so,

0.95 = 1/3+2/5+x/7

x=1.54