exam Maths Puzzle Numerical Ability

Solve

3/8x - 1/2y = 1
0.2x + 0.6y = 4

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exam Other Question

Can someone out there help me solve this problem?

I need to find the mode on this set of numbers:

41, 43, 56, 67, 69, 72

Thank you,
sher Jason had to submit 5 animation projects as per his syllabus in the fina semesters. He scored 82,85,78,and 88 points out of 100 in four projects. What should be his score in the fifth project so that the average of a projects is atleast 85?