exam Maths Puzzle Numerical Ability

can you help me in solving this problem:

if one-half of one integer is subtracted from three-fifths of the next consecutive integer, the difference is 3. what are the two integer.

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exam Other Question

Write an equation of the line through the point (a)parallel to the given line and (b)perpendicular to the given line:

a)point (4, -1) line x=3

b)point (-2, 5) line y=-4

Th
What is the total land area in Europe as a percent of Earth?

Europe has 3800 and Earth has 57,900. do i divide or what? i am lost

thank you