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1d
comment How does $\frac{-1}{x^2}+2x=0$ become $2x^3-1=0$?
multiply both the sides of the equation by $x^2$ and rearrange the terms on left hand side
1d
comment Measure 11 liters using bottles of 16, 6, and 3 liters
@David, you are right
1d
comment Measure 11 liters using bottles of 16, 6, and 3 liters
@David, do you mean, if 3L weighs x then 5L weighs (5x)/3? yes that's possible
1d
comment Measure 11 liters using bottles of 16, 6, and 3 liters
@David, since it is a puzzle we need to assume some things otherwise we cannot solve it. I can create $ n$ number of puzzles without any solution!
1d
answered Measure 11 liters using bottles of 16, 6, and 3 liters
Apr
22
comment Elementary Fractions
one of the approach: add the two given quantities, divide the result by 2, let this answer be X, (X - A) or (B - X) both will give you the required answer
Apr
22
answered problem involving percentage
Apr
22
comment Which sum formula should I use for arithmetic sequences?
if you can find or have all the terms on the right hand side of any of the formula then you can use it
Apr
22
comment If $a_n=n^x(n^{1/n^2}−1)$, show that $\ln{(1+a_n/n^x)} = \frac{\ln(n)}{n^{2}}$
rearrange the expression for $a_n$ so that on the righthand side only $n^{1/n^2}$ remains and then take $\ln$ on both the sides, note that $\ln a^b = b \ln a$
Apr
21
comment Percentage share question?
Person 1 needs $10\%$ and Person 2 needs $20\%$, $1:2$, so divide $2,700,000$ into 3 equal parts, Person 1 buys 1 part and Person 2 buys 2 parts
Apr
20
answered Multiplying whole number with fractions.
Apr
19
reviewed Approve How to find whole number answers in systems of square root equations
Apr
18
comment Circular measure
part (c), area of triangle=1/2 * base * height, Area of $OAD=\frac{1}{2}\times 2r\cos\theta \times r \sin \theta$
Apr
18
answered Circular measure
Apr
18
revised If $\frac{x-1}{e^x-1} = y$ then $x=?$
latex added
Apr
14
revised Summing of digits for large numbers
latex aded
Apr
7
comment Proof of sum results
first one is sum of Geometric Progression
Apr
4
comment Palindromes on a digital clock
I think it will be ${3 \choose 1}{5 \choose 1}$
Apr
4
comment Find the intersection of two lines passing through given points
slope of A $=\frac{-1-5}{-2-4}=\frac{-6}{-6}=1$
Apr
2
answered Working out percentages for payment table