NCERT Class 7 Mathematics Solutions: Chapter 4 –Simple Equations Exercise 4.1 Part 4

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1. Write the following equations in statement form:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

Answer:

(i) The sum of numbers and .

(ii) subtracted from .

(iii) Two times is .

(iv) The number is divided by .

(v) Three-fifth of the number .

(vi) Three times plus gets .

(vii) If you take away from times , you get .

(viii) If you added to half of , you get .

2. Set up an equation in the following cases:

(i) Irfan says that he has marbles more than five times the marbles Parmit has. Irfan has marbles. (Take m to be the number of Parmit’s marbles.)

(ii) Laxmi’s father is years old. He is years older than three times Laxmi’s age. (Take Laxmi’s age to be y years.)

(iii) The teacher tells the class that the highest marks obtained by a student in her class are twice the lowest marks plus . The highest score is . (Take the lowest score to be .)

(iv) In an isosceles triangle, the vertex angle is twice either base angle. (Let the base angle be in degrees. Remember that the sum of angles of a triangle is )

Answer:

(i) Consider Parmit has marbles.

number of marbles of Permit number of marbles of Irfan

(ii) Let Laxmi be years old.

Laxmi’s age Laxmi’s father’s age

(iii) Consider the lowest marks be .

Lowest marks Heighest marks

(iv) An isosceles triangle has two of its angle of equal measure.

Consider base angle be

Vertex angle

Sum of all integer angles of a