r, s, t, u are integers such that r

Question

r, s, t, u are integers such that r56 ?

(1) r, s, t, u are all consecutive multiples of 7
(2) t+(s+u)/2> 180

yuefei · Answer

1) INSUFF
The integers could by any consecutive multiples of 7

2) INSUFF
You can rewrite this as t+s+u > 360, however r could be a large negative integer or other positive integer


Both: 
C. SUFFICIENT

1) Tells us the integers are consecutive multiples, while 2) tells us that they are positive and thus can solve

yash500 · Answer

==
its 2t + (s+u)>360 .. just a correction..


I will chose option E.. means both are not sufficient. Because we do not know which one is +ve or -ve.

Fistail · Answer

C makes sense as we know r, s, t, and u are +ve consecutive integers.

yash500 · Answer

Fistail - again how do u know they are +ve integers? what if 
r, s, t, u - all are multiples of 7 but have -ve sign.. means -14, -21, -35?

thanks for explanation.

beckee529 · Answer

it cannot be -tive consecutive multiples of 7. the second statement would not hold true here
your example: -14, -21, -35 .. the sum would not be greater than 2*180
(2) t+(s+u) has to be greater than 360 where s<t<u

so i agreed with C

r, s, t, u are integers such that r<s<t<u. Is

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