Triangle + triangle + square = 23
triangle x square = 60
triangle?
square?

2 triangle+square=23
square=60/triangle

2 triangle+60/triangle=23

2 triangle^2+60=23 triangle

2 triangle^2-23 triangle+60=0

solving quadratic equation we get

triangle=15/2  , 4
15/2 is not possible so triangle=4
square=15

The probability of picking 2 green markers is 2/10