A number y greater than -8 and is at most -7

Yo need asap pls ! markin da brainiest too !

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

If it 8 inch candle burns at 7/10 inch per hour and a 6 inch candle burns at 1/5 inch per hour after how many hours would both candles be the same height