How can you show that the ratios 10: 4 and 15: 6 are equivalent

I dont know exactly but im pretty sure its 10 times 6 and 4 times 5 then multiply both of the answers and if it is a crazy decimal number then it is not equivalent and if it is a real number with only a couple numbers behind the decimal then it is equivalent.
   

M<E

Step-by-step explanation:

It would be m