The reciprocal of seven (7) would be 0.142857143
The geometric mean you would use is C
5:5 (first box, pencils to pens)
7:3 (second box, coloured pencils to crayons)
The probability of picking a pen (1st box): 5/10
The probability of picking a crayon (2nd box): 3/10
Probability of picking both: 5/10*3/10 = 15/100
37.5 km is equal to 15 cm
