Posted by John on Tuesday, May 31, 2011 at 3:13pm.
It's been a few years since I've done algebra, and many more since we've been expected to do it without a calculator like the GMAT rules state. Please help me figure out these two problems without the use of a calculator.
1.
__________________
√(16)(20) + (8)(32) = The answer is 4
2.
1

0.75  1
The answer is 24
I don't know how to get these answers. Please help. Thank you.

GMAT Algebra (NO CALC)  MathMate, Tuesday, May 31, 2011 at 3:27pm
I have a problem getting your answers two. They have probably been interchanged inadvertently.
1.
__________________
√(16)(20) + (8)(32)
=√(64*5+64*4)
=√(64*(5+4))
=8√(9)
=8*3
=24
2.
1

0.75  1
=1/(0.751)
=1/(0.25)
=1/(1/4)
=4/1
=4

GMAT Algebra (NO CALC)  John, Tuesday, May 31, 2011 at 3:42pm
Thank you, my mistake on mixing up the answers when typing. I get number two now. But on number one, how do you get to
=√(64*5+64*4)
and then do you combine 64s for
=√(64*(5+4))
thank you so much

GMAT Algebra (NO CALC)  MathMate, Tuesday, May 31, 2011 at 3:55pm
I break down 16*20 into its prime factors, or 64*5 to find if the other term has similar factors.
I did find a common factor of 64 by changing 8*32 to 4*64.
The rest you know.
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