Question

My son hasn't knows how to do that can somebody help him please .

Answer 1

A ratio compares two quantities. 

How may days are in May?  31
How many days in a year?  365

Now, we are being asked to compare may to a year. 

Answer:  31 to 365 

Now, the other is easy also. 

A triangle has 3 sides, and a square has 4. 

Answer: 3 to 4

Find equal ratio's

8/12 = 2/3 = 4/6 = 16/24

20/25 = 4/5 = 40/50 = 80/100

Done! Enjoy! :) I hope I helped your son. Take care.