There are three classes in the sixth grade of Hong Guang primary school, with 48 students in each class. The number of girls in class 6 1 is exactly the same as that in class 62. The number of girls in Class 63 accounts for five-eighths of the class. How many girls are there in the sixth grade?

48+48× 5/8 = 78 (person)

A gift candy is prepared by mixing milk candy and fruit candy. It is known that milk candy is 5.4 yuan per kilogram and fruit candy is 3 yuan per kilogram. Now, if you want to make a 4.8 yuan for each kilogram of gift candy, what proportion should milk candy and fruit candy be mixed?

(4.8-3):(5.4-4.8)=3: 1

Two cars, A and B, leave from A and B at the same time and go in opposite directions. A few hours later, they met. After meeting. Continue to drive at the original speed. After 5 hours, bus B arrives at location A, and car A exceeds location by 45 kilometers, accounting for 25% of the whole journey between location A and location B. How many kilometers does car A travel per hour?

( 1+25%): 1=5:4

5× 4/5 = 4 (hour)

45 ÷ 25% = 180 (km)

(180+45) ÷ (4+4) = 28.125 (km)