- 20 days
- 24 days
- 16 days
- 10 days

Option 3 : 16 days

Ace your Time and Work preparations for Work Efficiency with us and master Quantitative Aptitude for your exams. Learn today!

**Given**

X and Y completes a work in 8 days

**Calculation**

(X + Y)'s 1 day work = 1/8

(X + Y)'s 3 days work = 3/8

Remaining work = 1 - (3/8)

⇒ 5/8

X's does remaining work (5/8) work in 10 days

Let the number of days taken by X to complete a work is a days

(5/8) × a = 10

X work alone = (10 × 8)/5

⇒ 16 days

**∴ X completes a work in 16 days.**

India’s **#1 Learning** Platform

Start Complete Exam Preparation

Daily Live MasterClasses

Practice Question Bank

Mock Tests & Quizzes

Trusted by 2,29,87,486+ Students

Testbook Edu Solutions Pvt. Ltd.

1st & 2nd Floor, Zion Building,

Plot No. 273, Sector 10, Kharghar,

Navi Mumbai - 410210

[email protected]
Plot No. 273, Sector 10, Kharghar,

Navi Mumbai - 410210

Toll Free:1800 833 0800

Office Hours: 10 AM to 7 PM (all 7 days)