In how many of the four months did ruled…

In how many of the four months did ruled notebooks make up more than 60% of that month's notebook sales?

Question 18

HardOriginal question

The table shows the number of notebooks a stationery shop in Pune sold in four months.

Month	Ruled	Unruled
April	240	160
May	200	120
June	300	150
July	280	120

In how many of the four months did ruled notebooks make up more than 60% of that month's notebook sales?

1Correct answerYour answer2Correct answerYour answer3Correct answerYour answer4Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

April: $\frac{240}{400} = 60\%$ . May: $\frac{200}{320} = 62.5\%$ .
June: $\frac{300}{450} \approx 66.7\%$ . July: $\frac{280}{400} = 70\%$ .
May, June and July are above 60%; April is exactly 60%, so the count is 3.

Worth noting

A quick test: the share is more than 60% exactly when ruled notebooks are more than 1.5 times the unruled ones. 4 counts April, where the share is exactly 60%, which is not more than 60%. 2 counts only June and July, the two months with the most ruled notebooks, and misses May.

Concept: Comparing each row's share with a threshold
Typical timeTypical: 120 s
Your timeYours: —

The rule this testsTables

Practise this chapter →

Ten questions from Data Interpretation, at your own pace.

Practise this chapter →

Ten questions from Data Interpretation, at your own pace.

In how many of the four months did ruled notebooks make up more than 60% of that month's notebook sales?

Question 18

Explanation