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Q.Dharam and Karan were partners in a firm sharing profits and losses in the ratio of 7 : 3. On 1st April, 2025, they admitted Vinod as a new partner in the firm. Dharam surrendered 1/3rd of his share in favour of Vinod and Karan surrendered 1/4th of his share in favour of Vinod. The new profit sharing ratio will be : (A) 7 : 3 : 1 (B) 56 : 27 : 10 (C) 27 : 56 : 10 (D) 56 : 27 : 37

CBSECBSE Class XII Board 2026MCQ· 1mImportance★★★★★
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The new profit-sharing ratio after Vinod's admission is 56 : 27 : 37 (Option D). Dharam and Karan each sacrifice a portion of their original 7:3 ratio to give Vinod his share.

Concept First: Why We Calculate Sacrifice and New Ratio

When a new partner is admitted, the old partners surrender (sacrifice) a part of their own profit share to the newcomer. The new ratio is simply the old partners' remaining shares plus the new partner's acquired share. The key rule: the sacrificing ratio is the proportion in which the old partners give up their share; the new ratio is what remains after the sacrifice.

Here, Dharam and Karan do not sacrifice equally — Dharam gives up 1/3rd of his share, and Karan gives up 1/4th of his share. So we must first find each old partner's original share, then deduct the surrendered portion, and finally add Vinod's share.

Watch out

A common mistake is to treat the surrendered fractions (1/3 and 1/4) as fractions of the total profit. They are fractions of each partner's own share, not of the whole. Always read "surrendered 1/3rd of his share" as 1/3 × (that partner's old ratio).

Step-by-Step Solution

Step 1: Write the old ratio.

Dharam : Karan = 7 : 3.

Total parts = 7 + 3 = 10.

So Dharam's old share = 7/10, Karan's old share = 3/10.

Step 2: Calculate the surrendered shares.

  • Dharam surrenders 1/3 of his share = 1/3 × 7/10 = 7/30.
  • Karan surrenders 1/4 of his share = 1/4 × 3/10 = 3/40.

Step 3: Calculate the new shares of old partners.

  • Dharam's new share = Old share – Surrendered = 7/10 – 7/30. Convert to common denominator 30: 21/30 – 7/30 = 14/30 = 7/15.
  • Karan's new share = 3/10 – 3/40. Convert to common denominator 40: 12/40 – 3/40 = 9/40.

Step 4: Calculate Vinod's share.

Vinod gets the total surrendered amount:

= Dharam's surrender + Karan's surrender = 7/30 + 3/40.

LCM of 30 and 40 is 120: 28/120 + 9/120 = 37/120.

Step 5: Express all shares with a common denominator to find the ratio.

  • Dharam: 7/15 = 56/120 (multiply numerator and denominator by 8).
  • Karan: 9/40 = 27/120 (multiply by 3).
  • Vinod: 37/120.

So the new ratio = 56 : 27 : 37 (check: 56+27+37=12056+27+37=120, matching the common denominator). Comparing with the given options — (A) 7:3:1, (B) 56:27:10, (C) 27:56:10, (D) 56:27:37 — this matches option (D).

Therefore, the correct answer is (D) 56 : 27 : 37.

Tip

A quick check: the actual fractions 56/120, 27/120, and 37/120 sum to 120/120 = 1, confirming the whole profit is accounted for. The ratio parts (56, 27, 37) are simply these fractions scaled up by the common denominator 120 — they don't need to sum to the old ratio's total (10), since ratios are relative, not absolute.

Working Notes (for verification)

PartnerOld ShareSurrendered FractionSurrendered AmountNew Share (fraction)New Ratio Part
Dharam7/101/3 of his share7/307/10 – 7/30 = 14/30 = 7/15 = 56/12056
Karan3/101/4 of his share3/403/10 – 3/40 = 9/40 = 27/12027
Vinod——7/30 + 3/40 = 37/12037/12037
Total156/120 + 27/120 + 37/120 = 120/120 = 1120
✓Final answer

The new profit-sharing ratio is 56 : 27 : 37, which corresponds to option (D).

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