Question

what is ratio and why is it necessary?​

Answer 1

Answer:

"Ratios are especially useful when we need to scale an amount, i.e. increasing or decreasing a quantity or size of something.Ratios can be scaled up or down by multiplying both parts of the ratio by the same number"

Answer 2

"Ratios are especially useful when we need to scale an amount, i.e. increasing or decreasing a quantity or size of something.Ratios can be scaled up or down by multiplying both parts of the ratio by the same number"