One number is 1 less than a second number. twice the second number is 12 less than 3 times the first. find the two numbers

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?