The ratio of the weight of a book to the weight of a mug is 7:5. What fraction of the total weight of the book and mug is the weight of the book?

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.