Fill in the blanks :

(i) An equation involving one variable with highest power ……………, is called a linear equation in that variable.

(ii) The solution of an equation is also called …………… of the given equation.

(iii) The process in which we drop a term from one side of an equation and put it on the other side with sign changed is called …………… .

(iv) A linear equation can have at the most …………… solution(s).

(v) If thrice a number increased by 8 gives 23, then the number is …………… .

(vi) If x - 7 = 4, then 3x - 15 is equal to …………… .

The ABS school organised Science competition for seventh class students. In this exam, there were 40 questions, all MCQ types. Three marks were awarded for each correct answer and one mark was deducted for each question that was answered incorrectly or left unanswered.

(1) Aryan scored 76 marks. How many questions did he answer correctly ?

1. 23
2. 25
3. 7
4. 29

(2) Ramya scored 84 marks. If she attempted all the questions, how many of her answers were incorrect ?

1. 9
2. 10
3. 11
4. 12

(3) Hema's score was double the number of questions she attempted correctly. How many of her answers were correct ?

1. 10
2. 15
3. 20
4. 25

(4) Bilok's score was the highest in the class. His score was 12 marks less than the maximum marks. How many of his answers were correct ?

1. 35
2. 36
3. 37
4. 38