How To Answer This Maths Question?

The following is a mathematics question that I don't know how to answer. Anyone who expert in mathematics please tell the solutions. I really don't understand this topic: ratio.

the question :

The ratio of the number of children to the number of adults is 15 : 2. There are 1/7 more boys than girls. The number of girls is 60 more than the number of adults. How many adults and children are there altogether?

If anyone knows the answer or solution of doing this maths question, please tell me.

Thanks,
J.E