Ratio and proportion: watch it solved step by step

Share an amount in a ratio, simplify a ratio, solve a : b = c : ? and use the unitary method. Level: KS3 / GCSE. Type any problem of this kind and the Lab works it out and animates every move, with a plain-words explanation of why.

Worked example: Share 84 in the ratio 3:4

  1. The question. Share 84 between 2 people in the ratio 3 : 4.
  2. Add up the parts. The ratio says how many equal parts each person gets. Count the total number of parts.
  3. Find the value of one part. Divide the whole amount by the number of parts.
  4. Multiply each share by its parts. Each person gets their number of parts times the value of one part.
  5. Check. The shares must add back up to the whole amount.

Answer: 36 and 48

Practise ratio and proportion with problems the Lab marks for you.

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