Question 99686
We denote mother's age by x. And Meera's age by y. We can write 4*y = x or x/4=y the second equation might be (x+5)/3=y+5 or 3*(y+5)=x+5. Let's choose second option and create a system of 2 linear equations with 2 variables.

4*y = x
3*(y+5)=x+5
We can substitute x in terms of y into second equation, so we get the equation with only variable.
3*(y+5)=4*y+5 multiply
3*y+15=4*y+5 subtract 3*y
15=4*y-3*y+5
15=y+5 /-5
10=y
Now we know that Meera is presently 10 years old.
We can substitute our result into any equation of the original system.
4*10 = x
40= x
Mother's present age is 40.