Wide tables scroll horizontally. For detailed working, you may prefer a larger screen.
Required skills (click to reveal)
In a mixture used for painting, the ratio of red pigment to white pigment is 3:7. If 420 millilitres of white pigment are used, how many millilitres of red pigment are needed?
Express your answer as an exact fraction or whole number.
Press Start when ready. Time includes time spent in another tab. Submit your answer before opening a help panel for a timed rank.
My notes — optional, not graded
0 wordsNotes and scratch working stay in this browser and are linked to this question version. They are not graded or included in feedback. On shared devices, other people using this browser may see them.
For this question only. Your full notebook is on the dashboard.
Notes save in this browser. Download a copy to keep them elsewhere.
Report a problem or suggest an improvement
Your observations help improve this question. You can report an issue or recommend a better explanation, visual or experience.
Formula and explanation (click to reveal)
Opening this before your first submission makes the attempt practice only.
Formula
Explanation
Worked solution and answer (click to reveal)
Opening this before your first submission makes the attempt practice only.
Worked solution
- The ratio of red pigment to white pigment is given as 3:7. This means for every 3 parts of red pigment, there are 7 parts of white pigment.
- We are told that 420 millilitres of white pigment are used. This corresponds to the 7 parts in the ratio.
- To find the value of one part, divide the amount of white pigment by 7: 420 mL ÷ 7 = 60 mL per part.
- Since red pigment is 3 parts, multiply the value of one part by 3: 60 mL × 3 = 180 mL.
- Therefore, 180 millilitres of red pigment are needed.
Reference answer: 180 mL
Alternative methods (click to reveal)
Shortcuts are shown only when applicable. Check the conditions before using one.
Quick-method explanations are blurred in this trial preview. The standard formula and worked solution remain available.
Earlier attempts for this question
| # | Date / time | Your answer | Result | Seconds | Help revealed | Rank |
|---|
Worksheet details
Naming pattern: Topic_Grade_Complexity_YYYYMMDD_HH24MISS.html
Validation compares your answer with the generated reference. The model's reference can be wrong. Time ranks use an estimated student solving time, not a measured benchmark or a comparison with other students. An incorrect answer receives no speed rank.
NavGanitMate privacy & saved work
Saved in this browser. Your profile preferences, answers, practice history and notes are stored here when browser storage is available. They are not automatically uploaded to our servers. People sharing this browser may see saved work; changing the learner name does not create a separate private account. A nickname is enough.
Keep copies of important work. Clearing browser data, private browsing or changing browser or device can mean losing saved work. Download notes and export history separately. Downloads are copies of the selected content, not a complete account backup; not every format can be imported to restore your work. Keep these files somewhere private.
Visiting the website. Cloudflare helps deliver and protect this site and processes connection information such as IP addresses and requested pages. Server error logs may also contain request details. Security features may use cookies. This is separate from your browser-saved learning records. Cloudflare privacy information.
A parent-connection reminder uses a local list of up to five completed question IDs for this browser profile and a tab-session dismissal marker. Reminder activity is not uploaded and practice remains available.
Sharing feedback is your choice. A report includes your message and question/version details. Your saved profile, answers and notes are not automatically attached. Files you select can reveal personal details or contain embedded metadata: check and redact them before sharing. Diagnostic event codes and timestamps are included only after you enable logging. Sending email shares your message and attachments with the recipient and email providers. A download alone sends nothing to us. Website feedback delivery may be unavailable; only a confirmed receipt indicates it was received.
Files ready to save
If a file opens instead of downloading, use its save link below or your browser’s Save As command.