I WILL PICK YOU BRAINLIEST PLS, help with this! no one has really answered any of my questions so if you could help me with this on that would be great

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class