Cls. 7 Mathematics | Understanding Algebra – Forming and Solving Expressions / Equations

Jane is four times as old as her sister. Five years ago, their ages were 60 years.

2. Susan is twice as old as her cousin. In ten years, time the sum of their ages will be 80 years.

3. I think of a number y. If I multiply it by 14, my answer will be the square of 28,

4. The sum of three consecutive numbers is 90.

5. The angles of a triangle are 3y°, (2y+10°) and (y+ 20°).

6. John is 4 years older than his sister Joy. Joy is y years old now.

7. Two angles (y+85) ° and (4y-40) ° are supplementary.

8. Musa, Tom and Sam scored goals for their team during a football match. Musa scored n goals while Sam scored twice as many goals as Musa. Tom scored two goals less than Sam.

9. In a function, the number of women was twice that of men. The number of children was half the total number of men and women.  The function was attended by 270 people.

10. A rectangular container is 80 cm long, 50 cm wide and 40 cm high. The container is filled with water to a level 30 cm high. What is the volume of the empty space in the container?