Akhtar, Ben and Carl each have some money. Akhtar has £65
Ben has £100
Carl has three £5 notes, one £20 note and some £10 notes.
The mean amount of money per person is £80
How many £10 notes does Carl have?

47 - 90 = 43

43 - 180 = x

x = 137

b

step-by-step explanation:

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: