1:4 and 5:10 are not equivalent expressions
What are equivalent expressions.
Equivalent expressions are mathematical expressions that are not identical but when simplified, the resulting simplified term are the same,
Two expressions say X and Y are equivalent expressions if X = Y, and they can also be used interchangeably, say Y = X.
The given expression 1:4 is not equivalent to 5:10 because the resulting term in decimal form for 1:4 is 0.25 and the resulting term for 5:10 = 0.5.