exam Maths Puzzle Numerical Ability

Here are 2 superficies . The first one has 200 hectars and the second one 45 hectars.How much hectars of each superficie have to be cultivated for the wheat if in the first superfi

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find the value of r so that the line that passes through each pair of the points has the given slope.
1) (r,2) (5,r), m=0 Hello, how do i simplify (9 - 5i)(1 + 3i)