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Maths Puzzle
Numerical Ability
The rectangle has a perimeter of 78 centimeters.the length of the rectangle is 11 centimeters longer than triple the width. Find the demensions of the rectangle
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Sorry I had a wrong email address so here it is agagin;
A sum of $3500 is split between 2 investments, one paying 9% yrly interest the other paying 11%. If the return on th 11% in
x-y=7
x+y=5
3x-y=9
2x+y=6
it say use linear combinations to solve