What is the answer to the problem (74x-+21y)

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

Answer this two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: two right triangles abc and edc have a common vertex c. angle abc and edc are right angles. ab is labeled 13 feet, ac is labeled 15 feet, ec is labeled 10 feet, and ed is labeled 4 feet.what is the approximate distance, in feet, between the two poles? 11.14 feet16.65 feet14.35 feet15.59 feet

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.