Question

Paint is Red: Blue in a ratio 3:4. If 6 litres of blue is used, how much red?

Answer 1

`4.5` liters of red paint.

Explanation:

As red and blue paints are n the ratio of `3:4`,

for every `4` liters of blue paint, we need `3` liters of red paint

this means for every `1` liter of blue paint, we need `3/4` liters of red paint

and for `6` liters of blue paint, we need `3/4xx6` liters of red paint

i.e. `3/(cancel4^2)xxcancel6^3=9/2=4.5` liters of red paint.