Dear Sir/Madam,

I used to be really good with maths, but after my camping accident I cannot remember most of the things. Even the simply maths' problem solving I find it hard to teach my kid how to solve it. I need some help and guide here please. The question is like this:

Mike has only ducks and cows on his farm. The cows and ducks have 52 legs in total. There are 4 more cows than ducks on mike's farm how many Ducks are there on mike's farm?

How can I explain it to my kid. I know it is really easy but somehow my brain just won't function. Thank you kindly for your help and time.

Needed help urgently.

Desperate mum