Russian-English translations for ско́лько

• how long
  How long is that piece of string?
  I dont know how long the Amazon River is.
  How long is the flight?
• how many
  How many times have I told you not to slam the door?
  How many keys we have lost!
  I told him how many days the principal said he skipped school.
• how much
  How much cheese is left in the fridge?
  How much is left in the fridge?
  How much do you want for it?