# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 Re: Exercises » Differential Calculus » 2009-03-09 20:02:26

#2 i)
3 (3x^2 + 4x - 5)^2  *(6x + 4)

i beg to be pardoned for how i express my equations

## #2 Re: Puzzles and Games » Complete the series.... » 2009-03-09 19:40:31

gud one!! but i believe when it comes to 'trick' questions any answer is correct as long as you can explain it sensibly.. many roads lead to Rome

## #3 Re: Jai Ganesh's Puzzles » Multiple Choice questions: » 2009-03-08 10:08:19

#401
.63y - .45y  = 342
.18y = 342
y = 342/.18= 1900
.78y = .78*1900 = 1482!!

## #4 Re: Jai Ganesh's Puzzles » Oral puzzles » 2009-03-08 09:42:27

#642
7*25 = 175
3*20 = 60
3*28 = 84
60+84 = 144
175-144 = 31
is the remaining number 31?

## #5 Re: Puzzles and Games » Complete the series.... » 2009-03-08 09:29:44

yes i woz answering xxxix i tried to solve it non-mathematically.. the second digits of the numbers are 1,2,3&4 so i assumed the other two's wud be 5&6.. 1st 3 digits began with 6,5&6 so i guessed the next 3 as 989,is it too far fetched?

85, 96?