I'm not totally sure, but just doing it in my head:
BC = 15 cm
AB = 12.5 cm
and it's spelled "equilateral" for future reference :)
Sorry, here's the explanation:
So, start with triangle ABC. You know that an isosceles triangle has a base, and two equal sides. This means that once you subtract the side BC from the perimeter, you have the length of the other two equal sides combined meaning that if you divide that by 2, you will have the length of one of the equal sides, AB for example. Moving to the equilateral triangle, BCD. You know that with equilateral triangles, all sides are equal. The perimeter is 45, and because equilateral triangles have 3 equal sides, you divide 45 by 3, getting 15. Here it might help to draw a picture, but BC is one of the sides of your equilateral triangle meaning that BC is equal to 15. Then you move back to ABC. Remember what we said before, that once you subtract BC from ABC you get the sum of the other two equal sides. So, 40 - 15 is 25. Then, because there are two equal sides, you divide 25 by 2, getting 12.5 and that's the length of your other two side, AB and AC.
Let x be price of one apple and y be price of one orange.
Upon using our given information we will get a system of equation as:
Since we know that a system of equation will have a unique solution if,
, where 
and 
are coefficients of x and y terms of our one equation respectively; 
and 
are coefficients of x and y terms of our second equation respectively.
Let us check that our system of equations is solvable or not.
We can see that our system of equation is solvable and will have a unique solution.
We will use substitution method to solve our system of equations.
Upon substituting 
in 1st equation we will get,
Upon combining like terms we will get,
Multiplying both sides of our equation by -1 we will get,
Therefore, price of one orange is $1.
Now let us substitute y=1 in 1st equation.
Therefore, price of one apple is $1.2.
Answer:
There is a 5% difference
Step-by-step explanation:
80%-75%=5%
