Answer
$\dfrac{48}{125}=38.4\%$
Work Step by Step
You have to find the total number of blocks by adding the given colored blocks: $36+48+22+19=125$.
You have $125$ colored blocks and $48$ of them are green and have to find the probability of picking a green block:
$P(G)=\dfrac{\text{number of green blocks}}{\text{total number of blocks}}$
$P(G)=\dfrac{48}{125}= 38.4\%$
