exam Maths Puzzle Numerical Ability

Solve the open sentence. then graph the solution set.

l r+3 l = 10 l=absolute value marks

i didnt get this at all in class today, please help me.

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exam Other Question

The sum of two numbers is twenty. Three times the smaller is equal to two times the larger. Find the two numbers. Why is the set of natural numbers an infinite set but the set of blades of grass outside your yard a finite set?