Answer:
(i) Let the number of marbles of Parmit be\['x'\]. Then according to the question, we have \[7+5x=37\] \[\Rightarrow \] \[5x=37-7\] \[\Rightarrow \] \[x=\frac{30}{5}=6\] Therefore, Parmit has 6 marbles (ii) Let \['x'\] years be the Laxmi's age. Then according to the question, we have \[4+3x=49\] \[\Rightarrow \] \[3x=49-4\] \[\Rightarrow \] \[x=\frac{45}{3}=15\] Therefore, Laxmi's age is 15 years. (iii) Let \['x'\] be the number of fruit trees planted. Then, non-fruit trees \[=2+3x\] By question, we get \[2+3x=77\] \[\Rightarrow \] \[3x=77-2\] \[\Rightarrow \] \[x=\frac{75}{3}=25\] Therefore, the number of fruit trees planted is 25.
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