[Video] Q19: Kelly enlarged the area of a photograph to 250% of its original size. the original dimensions of the photograph were 5 inches by 7 inches. what is the area of the enlarged photograph, in square inches?

Explanation for Question 19 From the Math (Calc) Section on the 2019 April Sat

So for number 19, Kelly is enlarging the area of her photographs at 250% 2 of its original size. And we want to know the area of the new 3 enlarged photograph. So the key thing here is that Kelly and largest the area 4 and not the dimensions. So we need to use these dimensions to find the 5 original area and then take that area and increase it. 6 So the original area is going to be five times seven, 7 which is 35. 8 And now she enlarges that to 250%, 9 250% as a decimal is 2.5. 10 And we're multiplying that by the original area, 11 35, in order to find the new enlarged area, 12 you are allowed to use a calculator in this section. 13 So 2.5 times 35 is equal to 14 87.5, which is being.