Question

To make grey paint, black paint and white paint are mixed in the ratio 4:7. Tom uses 300 mL of black paint. How much white paint does he use? a) 525 mL b) 600 mL c) 5250 mL d) 180 mL

Answer 1

Tom uses 525 mL of white paint when he mixes it with 300 mL of black paint, using the given ratio of 4:7 for black to white paint.

Step-by-step explanation:

To determine how much white paint Tom uses when he has 300 mL of black paint, we need to use the given ratio of black to white paint, which is 4:7. This tells us that for every 4 units of black paint, there are 7 units of white paint. Our first step is to figure out how many units of black paint are in 300 mL if 4 units are represented by 300 mL.

Dividing 300 mL by 4 gives us the amount of black paint per single unit:

300 mL ÷ 4 = 75 mL/unit

Since the ratio is 4:7, we then multiply the single unit amount (75 mL) by 7 to find the amount of white paint:

75 mL/unit × 7 units = 525 mL

So, Tom uses 525 mL of white paint when he uses 300 mL of black paint. The correct answer is option a) 525 mL.