Set up an equation in the following cases:
(i) Irfan says that he has 7 marbles more than five times the marbles Parmit has. Irfan has 37 marbles. (Take m to be the number of Parmit’s marbles.)
(ii) Laxmi’s father is 49 years old. He is 4 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 is twice the lowest marks plus 7. The highest score is 87.   (Take the lowest score to be `l`.)
(iv) In an isosceles triangle, the vertex angle is twice either base angle. (Let the base angle be b in degrees. Remember that the sum of angles of a triangle is 180 degrees).

Explanation

(i) Let us take m be the number of Parmit's marbles

therefore, `5m+7 = 37`


(ii) Let us take the age of Laxmi be y years

so, `3y+4 = 49`


(iii) Let the lowest score be L

so,` 2L + 7 = 87`

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