Use pemdas (parenthesis, exponents, multiplication/division, addition/subtraction)
(28/4)*5-6+4^2
7*5-6+4^2
7*5-6+16
35-6+16
29+16
45
Your answer should be 45. Remember PEMDAS:)
Start by calling the shortest side
. We then know that the longer leg (call it
) is 7 feet longer i.e.
. We also know that the hypotenuse,
is 1 foot more than twice the short leg i.e.
. We now have 3 unknowns but only 2 equations to solve them. Luckily we know this is a right triangle so we can use the Pythagorean Theorem as our third equation:
Substituting known values:
This is now an equation in one variable and can be solved algebraically for
. Back-substitution can then be used for the other sides.
<em>8xy + 3xy + x</em>
<em>=</em><em> </em><em>1</em><em>1</em><em>xy</em><em> </em><em>+</em><em> </em><em>x</em>
<em>=</em><em> </em><em>x</em><em>(</em><em>1</em><em>1</em><em>y</em><em> </em><em>+</em><em>1</em><em>)</em>
It would be: 3 < 3.75 < 4.2 < 4.25 < 4.5 < 9
So, Mr Yeo has 32 litres of water to begin, by taking away the 3/8 (12 litres) you get 20 litres, dividing that by 4 gives you 5litres.
Your answer is then 5 Litres