Twice a number decreased by 30 is 50. What is the number?
40

80

120

160

What is best way to getting answer for my exam is

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Will give a: 122 b: 90 c: 48 d: 180