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Super difficult math problem in grade six
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)