Day 20 of 60 · Mon 19 Oct · Daily workbook · CAT in 41 days

Day 20: Time & Work + Venn Diagram Set + Psychology RC

Day 20 of the free ThinkCAT 60-day CAT challenge: 5 time & work questions and 3 spaced-review QA questions, a full venn diagram DILR set (4 questions), a psychology RC passage (4 questions), plus odd one out and para jumbles. Every question is a real CAT PYQ.

QA · 8
DILR · 4
VARC · 6
40 minutes
Real CAT questions

Concept card

Time & Work

Core formulas

A finishes in a days ⇒ rate 1/a per day. Rates add; days do not
A and B together: ab/(a + b) days
Man-days: M₁D₁H₁/W₁ = M₂D₂H₂/W₂
Pipes: inlets +, outlets and leaks −

60-second shortcut · LCM units, zero fractions

A takes 12 days, B 18. Work = 36 units: A does 3 a day, B 2. Together 5 a day ⇒ 7.2 days.

Trap box

Looks like: 10-day A + 15-day B: 12.5 days togetherActually: 10 × 15 ÷ 25 = 6 days
Looks like: 50% more efficient ⇒ 50% less timeActually: Time × 2/3: 33.3% less

From the free Arithmetic Formula + Trap Book (PDF).

What's in Day 20

QA: Time & Work (5) + 3 spaced-review questions
DILR: Venn Diagram set, 4 questions
RC: Psychology passage
VA: Odd One Out, Para Jumbles

Year, slot and question number for each question appear with the answer key after you submit.

Get the workbook PDF every morning

The day’s PDF is posted at 6:00 AM in the ThinkCAT WhatsApp group, with the toughest question explained every evening.

Join on WhatsApp

Loading ThinkCAT...