AIEEE Exam undefined

In a trianglePQR, if 3 sin P + 4 cos Q = 6 and 4 sin Q + 3 cos P = 1, then the angle R is equal to?
R is in form of pie.

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AIEEE Other Question

A spherical balloon is filled with 4500pie
cubic meters of helium gas. If a leak in the balloon causes the gas toescape at the rate of 72pie cubic meters per minute, then the rate (in meters per minute) at which the radiusof the balloon decreases 49 minutes after the leakage began is :
(1)7/9
(2)9/7
(3)2/9
(4)9/2 f 100 times the 100th term of an AP with non zero common difference equals the 50 times its 50th term, then the 150th term of AP is?