3x-5=30 how do you solve this

Can't gugys answer the ratio question. this is urgent the plans of a building is drawn toward scale of 1: 1000. kfc the foyer on the plans measures 62mm by 54mm, how large is the foyer in real life?

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?