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In 6 years, Raj's father will be twice Raj's age then. Two years ago, while his mother was twice his age then. If Raj is going to be 25 years old 3 years from now, then what is the sum of his parent's age now?

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Jake is faster than Paul. Jake and Paul each walk 40 km. The sum of their speeds is 13 km/h and the sum of time taken by them is 13 hours. Then Jake’s speed in KMPH is equal to
(a)9
(b)7
(c)8
(d)13
The interior angle of a regular polygon is 156 . How many diagonals does the polygon have ?
(a)60
(b)90
(c)75
(d)120