My Math Forum Is this a trick

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

February 7th, 2016, 11:29 AM   #1
Newbie

Joined: Feb 2016
From: New Zealand

Posts: 22
Thanks: 0

Is this a trick

Quote:
 Divide 40 by one and a half and add 10

How?

 February 7th, 2016, 11:36 AM #2 Math Team     Joined: Jul 2011 From: Texas Posts: 3,002 Thanks: 1587 $40 \div \dfrac{3}{2} + 10 \ne 90$ now, $40 \div \dfrac{1}{2} + 10 = 90$
 February 7th, 2016, 06:05 PM #3 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry You mean it is translated as "divide 40 by one, then by half, and add 10"?
 February 8th, 2016, 09:03 AM #4 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 That is what is suggested. Kiwis, where did you get the "90" from? 40 divided by "one and a half" is 80/3= "26 and 2/3". Then "add 10" is "36 and 2/3".
 February 8th, 2016, 10:24 AM #5 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 Kiwis seems to post these "confusing" problems fairly often; wonder if he's doing it on purpose...
 February 9th, 2016, 07:21 PM #6 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry Or the question wasn't in English and it's just lost in translation. Didn't I experience similar case before?

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