exam Maths Puzzle Numerical Ability

7P(n,3) = 6P(n+1,3)
Not sure why the answer is n=20.

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exam Other Question

Suppose at the kickoff of a football game, the receiver catches the football at the left side of the goal line and runs for a touchdown diagonally across the field. How many yards would he run? (A football field is 100 yards long and 60 feet wide.) a tank contains 15,360 L of water. At the end of each day, half of the water is removed and not replaced. How much water is left in the tank after 10 days?

Can you show me how t