After selling $5 \%$ of a quantity of sugar, $5\, kg$ of sugar remains. Find the total quantity of sugar. in $kg$

Albert buys $4$ $horses$ and $9$ cows for $Rs. 13400$. If he sells the horse at $10 \%$ profit and the cows at $20 \%$ profit, then he earns a total profit of $Rs.\, 1880 .$ The cost of a horse is (in $Rs.$)

Nutan bought a watch with $24 \%$ discount. If she pays $Rs.\, 779$ for that watch then what is the marked price of watch in $Rs.$?

While selling a watch, a shopkeeper gives a discount of $15 \% .$ If he gives a discount of $20 \%,$ he earns $Rs.\, 51$ less as profit. What is the original price of the watch? (in $Rs$)

Ravipurchases $90$ pens and sells $40$ pens at a gain of $10 \%$ and $50$ pens at a gain of $20 \% .$ Had he sold all of them at a uniform profit of $15 \%$ he would have got $Rs.\, 40$ less. Find the cost price of each pen in $Rs.$

A man buys an article for $10 \%$ less than its value and sells it for $10 \%$ more than its value. His gain or loss percent is