She is right, however her explanation is wrong.
In order to find the unit price, you need to divide the amount by the cost.
You will then see that 12 divided by 2.39 < 18 divided by 3.39.
The smaller unit price is obviously the better buy.
125/100 = 425/x. first find x. so multiply both sides by 100
so 125=42500/x. now multiply both sides by x
so 125x=42500. divide both sides by 125
so x=340. now, find 65% of 340. to find this, we set up the proportion (like the previous one) 65/100=x/340
we multiply both sides by 100
so 65=100x/340
multiply both sides by 340
so 22100=100x
divide both sides by 100
so x = 221
which is 65% of the number
Sixty nine and seven hundredths
A 45° sector is 1/8 of the area of the circle, so is (72π m^2)/8 = 9π m^2.
