3 questions on percentage ❤️

Write the sentence as an equation. b increased by 281 is d

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

What percent of 18 is 24? and plz explain thx.