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AMO 2027 Grade 6 SET 5 - Self-study

Question 1

Several people were surveyed for their preference for 4 drinks A, B, C and D. All the people surveyed are represented in the graph below. If the fraction of people who preferred A to those who preferred D is $\frac{m}{n}$, what is $m+n$?

Editorial clarification: take m and n to be positive integers with m/n in lowest terms. The original statement omits this condition. The vertical axis shows the number of people.

Question illustration

**Input:** Enter the integer only, without units.

Question 2

Two identical rectangular cards partially overlap. Their overlap is a square of area $4\text{ cm}^2$. The total area of the non-overlapping portions of the two cards is $12\text{ cm}^2$. What is the area of one card, in square centimetres?

**Input:** Enter the integer only, without units.

Question 3

Jessica has a rectangle made of construction paper. She folds it in half to form another rectangle, then folds that rectangle in half to form a 6-cm-by-6-cm square. What is the area, in $\mathrm{cm}^2$, of the original rectangle?

**Input:** Choose one option.
  1. 36
  2. 72
  3. 144
  4. 288
  5. 324

Question 4

Each of 10 cards displays two different symbols, one on the front and one on the back. The five symbols are $\clubsuit,\heartsuit,\spadesuit,\diamondsuit,\bullet$. The front of each card is shown. No two cards have the same unordered pair of symbols. What is the least number of cards you can turn over to ensure that $\bullet$ appears?

Question illustration

**Input:** Enter the integer only, without units.

Question 5

What is the value of $80\times3-70\times4+60\times5-50\times6+40\times7-30\times8+20\times9$?

**Input:** Choose one option.
  1. 150
  2. 180
  3. 220
  4. 250
  5. 300

Question 6

How many lines of symmetry does a parallelogram have? For this question, use a general parallelogram that is neither a rectangle nor a rhombus.

**Input:** Choose one option.
  1. 1
  2. 2
  3. 3
  4. 4
  5. 0

Question 7

Remi had a square garden with an area of 16 square meters. She extends the length of the garden by 3 meters and the width by 2 meters. What is the new perimeter, in meters, of the garden?

**Input:** Choose one option.
  1. 26
  2. 24
  3. 22
  4. 20
  5. 18

Question 8

In the cryptarithm $\overline{TIC}+\overline{TAC}+\overline{TOE}=\overline{WIN}$, different letters represent different decimal digits and equal letters represent the same digit. Given $A=5$ and $O=4$, find the greatest possible value of $\overline{WIN}$. The leading digits $T,W$ are nonzero.

Question illustration

**Input:** Enter the integer only, without units.

Question 9

Four darts are thrown at the dartboard shown. A miss scores 0 points. Add the four scores. Find the least whole-number total that is impossible to obtain.

Question illustration

**Input:** Choose one option.
  1. 23
  2. 24
  3. 37
  4. 38
  5. 39

Question 10

Three brothers have a total age of 32 years. The oldest is twice as old as the youngest. The two older brothers differ in age by 3 years. How old is the youngest?

**Input:** Choose one option.
  1. 5
  2. 7
  3. 9
  4. 11
  5. 13

Question 11

A photographer enlarges a photo diagonally in software to fit a digital album. The larger photo keeps its proportions and is neither squished nor stretched disproportionately. The original dimensions are 6 inches by 4 inches; the new dimensions are 12 inches by $p$ inches. Find $p$.

**Input:** Choose one option.
  1. 8 inches
  2. 12 inches
  3. 10 inches
  4. 2 inches
  5. None of the above

Question 12

How many three-digit natural numbers are divisible by 5? Natural numbers here are positive integers starting from 1.

**Input:** Choose one option.
  1. 200
  2. 201
  3. 180
  4. 198
  5. 199

Question 13

Michael opens his favourite mathematics puzzle book and notes that the product of the page numbers facing him is 462. Find the sum of these two page numbers.

Editorial convention: treat the two page numbers as consecutive positive integers, as the source intends; disregard the left/right parity convention of ordinary book pagination.

**Input:** Choose one option.
  1. 22
  2. 43
  3. 441
  4. 484
  5. 21

Question 14

Find the ones digit of $2^{10}+3^9$.

**Input:** Choose one option.
  1. 1
  2. 3
  3. 5
  4. 7
  5. 9

Question 15

Evaluate $32.345+32.435-23.435$.

**Input:** Choose one option.
  1. 88.215
  2. -23.435
  3. 41.345
  4. -23.525
  5. 23.345