exam Maths Puzzle Numerical Ability

Find the point of intersection of the graphs of x-y=-18 and x+y=-9.

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exam Other Question

L+2=14
Y-1=91
18=4P Your teacher is giving you a test worth 100 points containing 40 questions. There are 2-point and 4-point questions on the test. How many of each type of question are on the test?