Let g be the number of grandchildren, and d be the number of dogs. They both have only one head, so the number of heads is

Grandchildren have 2 legs, while dogs have 4. So, the total number of legs is

From the first equation (the one for the heads) we can derive

Substitute this into the second to get

So, there are 9 dogs and (from the first equation

20/35 gallons per hour
(20/35) * 47 = around 27 gallons in 47 hours
First subtract the 7 from both sides and that would equal 2x+9=2x then subtract 2x and the answer is 9
Answer:
Can you clarify?
Step-by-step explanation: