Twice the difference of a number and 5 is equal to three times the sum of the number and 5. Find the number

In a box lenght 1m breadth 60 cm and height 40 cm small rectangular packets of dimension 5 cm into 8 cm into 10 cm are packed. how many such small packets can be packed in the big box?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

If i had 1234 apples and 1 banana what is the total amount