ข้อสอบGED MATHEMATICAL REASONING [Calculator] ชุดที่ 4
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#1. What is the median of these numbers? 4, 9, 13, 8, 15, 18, 5
Write the numbers in order:
4, 5, 8, 9, 13, 15, 18
Since we have 7 numbers (7 is odd), then the median is the number in the middle, which is 9.
#2. The radius of a cylinder is 8 inches and its height is 12 inches. What is the surface area of the cylinder in square inches? Write your answer in the box below. (π equals 3.14)
Surface Area of a cylinder = 2πr (r h),
The radius of the cylinder is 8 inches and its height is 12 inches. π is about 3.14. Then:
Surface Area of a cylinder = 2 (π) (8) (8 12) = 320 π = 1004.8
#3. The price of a sofa is decreased by 25% to $420. What was its original price?
Let 𝑥 be the original price.
If the price of the sofa is decreased by 25% to $420, then: 75 % 𝑜𝑓 𝑥 = 420 ⇒ 0.75𝑥 = 420 ⇒ 𝑥 = 420 ÷ 0.75 = 560
#4. Which graph corresponds to the following inequalities?
y ≤ x+4
2x + y ≤ -4
#5. A bank is offering 4.5% simple interest on a savings account. If you deposit $8,000, how much interest will you earn in five years?
Use simple interest formula:
𝐼 = 𝑝𝑟𝑡
(I = interest, p = principal, r = rate, t = time)
𝐼 = (8000)(0.045)(5) = 1800