Others Maths Puzzle

Is x,y,z are non negative integers find number of solutions for (x,y,z) if 3x+5y+4z < 80 & x+y-z > 25

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Others Other Question

If a train starts journey from A to B, he meet an accident 80 km away from A after accident he rest there 30 min and then starts his journey with 4/5 of his previous speed and reached at B two hours late,, if he met accident 80 kmtrs further then train will late only one hour, Find actual velocity of train. Twelve friends go out for dinner. Two tables. One with 7 chairs. Other with 5. How many ways for the group to settle ?