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Element of a Set ...pls show working

by Jeanel
(Moril)











































N is an element of the set {0.2, 0.7, 1.4, 2.0, 7.0} and 4.2N/1.2 is an integer. What is N?


(pick answer below)

F. 0.2
G. 0.7
H. 1.4
J. 2.0
K. 7.0

Comments for Element of a Set ...pls show working

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Oct 10, 2010
Element of a Set
by: Staff

The question:

by Jeanel
(Moril)


N is an element of the set {0.2, 0.7, 1.4, 2.0, 7.0} and 4.2N/1.2 is an integer. What is N?


(pick answer below)

F. 0.2
G. 0.7
H. 1.4
J. 2.0
K. 7.0




The answer:


(4.2)(0.2)/(1.2) = 0.7
(4.2)(0.7)/(1.2) = 2.45
(4.2)(1.4)/(1.2) = 4.9
(4.2)(2.0)/(1.2) = 7.0, at last – the result is an integer
(4.2)(7.0)/(1.2) = 24.5


The final answer: answer choice J.

N = 2.0 is the only element of the set which yields an integer for 4.2N/1.2.


Thanks for writing.


Staff
www.solving-math-problems.com



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