exam Maths Puzzle Numerical Ability

Please find the value of the expression 4P4

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exam Other Question

How do you find proportion

example

Which of these is the correct proportion
72:24=8:3 WRONG
36:48=2:3 WRONG
2:5= 30:75 CORRECT
9:7= 81:54 WRONG Tim bought 3 times as many .20 stamps as .10 stamps and 6 times as many .10 at .05 stamps. He spent $63.75 on stamps. How many of each kind did he buy?