exam Maths Puzzle Numerical Ability

5x-y=10
2x+y=4

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exam Other Question

on the 1st day 2721 entered the contset. four times that many entered the contest the 2nd day. only 977 entered the contest on the third day. how many entered the contest in all? Two number cubes are rolled and the first cube shows a 3. Find the probability that you obtain a sum of 7.