Mark’s father is 55. this is 15 years older than twice mark's age. how old is mark? explain the method used for solving the problem. include a restatement of the problem, the steps you used to solve the problem, the answer, and an explanation of how you know the answer is correct.

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!