book Maths Puzzle Numerical Ability

what is this answer? 110+R+X=312 HOW DO I FIND OUT HOW TO DO THIS, AND WHATS THE ANSWER, THANK YOU

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book Other Question

5. The width of a rectangle is 15 feet less than its length, and the perimeter is 210 feet. Find the width:
a. 60 feet b. 35 feet c. 45 feet d. 40 feet e. none
x=3y-1
x+2y=9

How do I solve the sytem of equation using the subsitution method? Please show the work!