jagan1k

32^5=(2^5)^5, so x=25

I am getting 9 too.

can somebody tell me if the difficulty level of CR in OG same as it is in actual GMAT.

IMO 9, let s- speed of stream and v- speed of boat, then v+s=10 and v-s=8 solve for v,

x=1.2y, y=1.2z, w=0.8x => w=.96y, and since y=.12z w=1.152z i.e 15.2% so A

336=92x+32-800 x=1104/92=12 so C

IMO A. since k is even and r is odd, (odd/even) can not be an integer, this includes the case for k=0 too.

IMO B, what is OA

let r be radius, and oc=x then x+2=r and 2*(sqroot(r^2-x^2)=12 so x=8 and r=10, area=100pi

IMO C, 39*7+77=350. correct me anyone if i am wrong.

sjd, i think cesar meant (2*4*6..100)+1= (2*1)*(2*2)*(2*3)*(2*4).....*(2*50)+1 =2^50 * (1*2*3...50)+1 =2^50 * (50!)+1 here 50! is more important than the powers of 2 since 50! contains our prime numbers from 2 to 47.

IMO D,don't know if there is any trick involved.

Imo B

for (1) f(x)=x^2(1-x)^2 and for (2) 1/5, correct me if i am wrong

IMO 1. 1*x+2*y+3*z=1.5(x+y+z) x=y+3z