Two types of radio valves A, B are available and two types of radios P and Q are
assembled in a small factory. The factory uses 2 valves of type A and 3 valves of
type B for the type of radio P, and for the radio Q it uses 3 valves of type A and 4
valves of type B. If the number of valves of type A and B used by the factory are
130 and 180 respectively, find out the number of radios assembled. Use Cramer’s
rule to solve.
