Paint is red : blue in a ratio of 2 : 4. if 5 litres of red is used how much blue is used

10 litres because in the ratio 2:4

                                                 ↑ Four is double the 2

So this tells us that there is twice as much red paint as there is blue paint. And if there is five litres of red paint then double that is 10, so there is ten litres of blue paint.

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet