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

A sherical water tank forms the top of a water tower. From calculations made by the city engineer, it is known to hold a maximum of 1,000,000 cubic feet of water. The city council Change 136 to percentage.