This is a trick question. 7 families had a parakeet.
Answer:
20
Step-by-step explanation:

multiply both sides by 35

divide both sides by 35

Answer:
read the answer through and collect all the information you can
Answer:
4 x (7-x)
Step-by-step explanation:
4 times (multiply) the difference (subtraction) of 7 and a number (seeing as how you don't know that number use a variable, x)