Identify the steps involved in proving p if and only if and (p and q) or (not p and not q) are logically equivalent

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min. if they did not stop driving, how many miles could kyle and elijah drove in a whole day? ? 1 day = 24 hours. plzzz write a proportion i will give you 100 points

Adele is five years older than timothy. in three years, timothy will be 2/3 of adele’s age. what is adele‘s current age?