UPSC CDS 2 2021 Math Paper

Given, Sheela stitches a suit in 2 days.
∴ Sheela's 1 day's work =‌

1

2

suit
Meena stitches a suit in ‌

3

2

days.
∴ Meena's 1 day's work
=‌

1

3∕2

=‌

2

3

‌ suit. ‌
Sheela and Meena's 1 day's work
‌‌=‌

1

2

+‌

2

3

‌‌=‌

3+4

6

=‌

7

6

‌ suit ‌
Let number of days will both take in stitching 30 suits
=30×‌

6

7

=‌

180

7

Hence, the required number of days are 35 days.