There were 100 coins in a box. The ratio of coins to notes was 4 : 7.
After 25 coins were removed and some notes were added to the box,
the ratio of coins to notes became 1 : 3.
How many notes were added to the box?

the answer is 8/21

hope this

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%