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Question

Raghav can do a work in 15 days and Akshay in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
$\frac{8}{15}$

Work Rate Calculation

First, determine the daily work rate for both Raghav and Akshay.

  • Raghav's daily work rate: $\frac{1}{15}$ of the work.
  • Akshay's daily work rate: $\frac{1}{20}$ of the work.

Combined Work Rate

Calculate their combined daily work rate when they work together.

Combined rate = Raghav's rate + Akshay's rate

Combined rate = $\frac{1}{15} + \frac{1}{20}$

To add these fractions, find a common denominator, which is 60.

Combined rate = $\frac{4}{60} + \frac{3}{60} = \frac{7}{60}$ of the work per day.

Work Done in 4 Days

Calculate the total fraction of work they complete together in 4 days.

Work done = Combined rate $\times$ Number of days

Work done = $\frac{7}{60} \times 4$

Work done = $\frac{28}{60}$

Simplify the fraction: Work done = $\frac{7}{15}$

Fraction of Work Left

Determine the fraction of the work that remains unfinished.

Total work is represented as 1.

Work left = Total work - Work done

Work left = $1 - \frac{7}{15}$

Work left = $\frac{15}{15} - \frac{7}{15} = \frac{8}{15}$

Therefore, the fraction of the work left is $\frac{8}{15}$.

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