Twice a number is equal to 35 more than seven times the number. find the number

You are cycling around europe with friends. you book into a hostel and you ask the owner what the ratio of men to women is currently staying there. there are 24 men and 6 women. what is the ratio of men to women in its simplest form?

If i have one apple and give you the apple, how many apples do i have?

If the tip varies directly with the number of guest which equation represents between the tip, t, and the number of guest, g?