2019年北美sat考试答案_2019年SAT模拟考试题：SAT数学练习题

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　　1. Which of the following could be a value of x, in the diagram above?

　　A. 10

　　B. 20

　　C. 40

　　D. 50

　　E. any of the above

　　2. Helpers are needed to prepare for the fete. Each helper can make either
2 large cakes or 35 small cakes per hour. The kitchen is available for 3 hours
and 20 large cakes and 700 small cakes are needed. How many helpers are
required?

　　A. 10

　　B. 15

　　C. 20

　　D. 25

　　E. 30

　　3. Jo's collection contains US, Indian and British stamps. If the ratio of
US to Indian stamps is 5 to 2 and the ratio of Indian to British stamps is 5 to
1, what is the ratio of US to British stamps?

　　A. 5 : 1

　　B. 10 : 5

　　C. 15 : 2

　　D. 20 : 2

　　E. 25 : 2

　　4. A 3 by 4 rectangle is inscribed in circle. What is the circumference of
the circle?

　　A. 2.5π

　　B. 3π

　　C. 5π

　　D. 4π

　　E. 10π

　　5. Two sets of 4 consecutive positive integers have exactly one integer in
common. The sum of the integers in the set with greater numbers is how much
greater than the sum of the integers in the other set?

　　A. 4

　　B. 7

　　C. 8

　　D. 12

　　E. it cannot be determined from the information given.

　　SAT模拟考试题答案：

　　1.Correct Answer: B

　　Explanation:

　　The marked angle, ABC must be more than 90 degrees because it is the
external angle of triangle BDC, and must be equal to the sum of angles BDC (90)
and DCB. Also ABC is not a straight line and must be less than 180. Therefore 90
< 5x < 180 The only value of x which satisfies this relation is 20.

　　2.Correct Answer: A

　　Explanation:

　　20 large cakes will require the equivalent of 10 helpers working for one
hour. 700 small cakes will require the equivalent of 20 helpers working for one
hour. This means if only one hour were available we would need 30 helpers. But
since three hours are available we can use 10 helpers.

　　3.Correct Answer: E

　　Explanation:

　　Indian stamps are common to both ratios. Mul

　　ltiply both ratios by factors such that the Indian stamps are represented
by the same number. US : Indian = 5 : 2, and Indian : British = 5 : 1. Multiply
the first by 5, and the second by 2.

　　Now US : Indian = 25 : 10, and Indian : British = 10 : 2 Hence the two
ratios can be combined and US : British = 25 : 2

　　4.Correct Answer: C

　　Explanation:

　　Draw the diagram. The diagonal of the rectangle is the diameter of the
circle. The diagonal is the hypotenuse of a 3,4,5 triangle, and is therefore, 5.
Circumference = π.diameter = 5π

　　5.Correct Answer: D

　　Explanation:

　　If two sets of four consecutive integers have one integer in common, the
total in the combined set is 7., and we can write the sets as n + (n + 1) + (n +
2) + (n + 3 ) and (n + 3) + (n + 4) + (n + 5) + (n + 6) Note that each term in
the second set is 3 more than the equivalent term in the first set. Since there
are four terms the total of the differences will be 4 x 3 = 12

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