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?
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(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
or
(c) Let the number of fruit trees planted be z.
Then according to question, we have :
or
or