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4. Solve the following riddle:
I am a number,
Tell my identity!
Take me seven times over
And add a fifty!
To reach a triple century
You still need forty!

Let the number be x. According to the question the equation is :                          or                                    or                                                  or                                                    Hence the number is 30.

3.  Solve the following:
(i) Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. How many marbles does Parmit have?
(ii) Laxmi’s father is 49 years old. He is 4 years older than three times Laxmi’s age. What is Laxmi's age?
(iii) People of Sundargram planted trees in the village garden. Some of the trees were fruit trees. The number of non-fruit trees were two more than three times the number of fruit trees. What was the number of fruit trees planted if the
 number of non-fruit trees planted was 77?

(a)  Let the number of Parmit's marble be n. Then according to question, we have :                                  or                                          or                                          or                                              (b) Let the age of Laxmi be x. Then according to question, we have :                                  or                                     ...

2.   Solve the following:
(a) The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest score is 87. What is the lowest score?
(b) In an isosceles triangle, the base angles are equal. The vertex angle is 40\degree. What are the base angles of the triangle? (Remember, the sum of three angles of a triangle is 180\degree).
(c) Sachin scored twice as many runs as Rahul. Together, their runs fell two short of a double century. How many runs did each one score?

(a)    Let the lowest score be l. Then according to the question, we have :                                      or                                              or                                                Thus the lowest marks are 40.   (b)  Let the base angle of triangle is . Then according to question, we get :                              or                                      or     ...