At a school event there were 96 girls. the ratio of number of girls to the number of boys was 4: 5.after some time some boys arrived and the ratio became 2: 3 .how many boys arrived?

Which option identifies how kevin should proceed in the following scenario? four years ago kevin designed an mp3 player for young children. now that technology has changed, he would like to update his design to ensure that it encompasses cutting-edge techniques. by creating a third-angle projection of his ideas by designing an isometric projection of his new ideas by referring to past designs and illustrations of his original model by conferring with engineers who have improved upon similar devices