Greatest common factor for 21 and 40

You are making a blueprint of your bedroom and you plan to use a scale factor of 18 . the actual width of your room is 14 feet and the actual length of your room is 16 feet. determine the width and length of your room on the blueprint. on the blueprint, your room will have a width of feet and a length of feet.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?