There are 624 students at lincoln middle school. 78 of the students are left-handed. what percent of students at lincoln middle school are left-handed?

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.

Find two numbers if their sum is 91 and the ratio is 6: 7?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?