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OpenStudy (shubhamsrg):
If x, y, and k are positive numbers such that ((10x)/(x+y)) + ((20y)/(x+y)) = k and if x < y, which of the following could be the value of k? A. 10 B. 12 C. 15 D. 18 E. 30
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OpenStudy (shubhamsrg):
nops..30 is not the ans..
OpenStudy (shubhamsrg):
what makes you go for 30?
OpenStudy (anonymous):
give me a sec
OpenStudy (anonymous):
12 or 18
OpenStudy (anonymous):
is dat rite??
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OpenStudy (shubhamsrg):
18's the ans.. but i'd to know your solns.. i'll post mine after some time..
OpenStudy (anonymous):
|dw:1341560170661:dw| in the LHS the second term is positive....so the ans is GREATER than 10 and ti get 15....(y/x+y)=1/2....which means x=y which is not possible and obviously 30 is ruled out...
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