can any1 answer this using order of calculations??
determine: (5x4-2) divide by 3 +3(9-7)
poopy Fri 05/09/08 19:13
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Question Author
Doc.Spock you are not been very helpful here! lol
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I make it 12, and so does Excel
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5 x 4 = 20, 20 - 2 = 18
(9-7) = 2, 2 x 3 = 6, 6 + 3 = 9
18 / 9 = 2.
As per the answers from gen2 and taranis.
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sorry, 2 is of course correct. Read it wrong, as usual.Too much whisky-that's my excuse!
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PEMDAS aka Please Excuse My Dear Aunt Sally
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dont forget the
BODMAS rule,
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Hmm
Others seem to be seeing brackets where they don't exist. (That's probably because of the difficulties of typing mathematical symbols, exactly as they appear on paper, in Answerbank).
If the question appears thus:
(5 x 4 -2) ÷ 3 + 3(9 - 7)
the answer is 12
That's because the addition should be the final operation. The terms to the left of the '+' sign are worked out as follows:
Start with 5, multiply it by 4 (Answer = 20)
Subtract 2 (Answer = 18)
Divide by 3 (Answer = 6)
To the right of the '+' sign, we have:
Start with 9, take 7 (Answer= 2)
Multiply by 3 (Answer = 6)
Lastly, add the left side (6) to the right side (6). Answer 12
The answer 2 has been offered by others because they've left the division until the last operation. That would only be correct if the question was presented thus:
(5 x 4 - 2) ÷ ( (3 + 3(9 - 7))
Chris
(Former A-level maths teacher)
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Question Author
CHRIS, thank you so much. So wot do you do with this 1 as they is no + in it? i know the order of calculations say to do the multiplications & divisions 1st, but my brain is hurting!!! lol
5 (4-2)² ÷ 4 - (3-9)(8-6)
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Square the result of the first bracket and multiply by the 5 gives you 20 and this is divided by 4 giving 5. The product of the final pair of brackets is -12 and so we finish the 5 - -12 to get 17. I would also have read your original problem as dividing by the result of 3 + 3(9-7) and so got 2
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Thanks for the reply, Poopy.
Suzyboo has saved me the trouble of answering your latest question, with an admirable reply.
Chris
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