Three corner triangles are cut from an equilateral triangle, leaving a hexagon. One removed triangle is right-angled, another is isosceles, and the last contains a 50° angle. Find the largest angle of the hexagon.
Each candy jar contains either 2 apple and 4 banana candies, or 3 apple and 3 banana candies. Grandma has 25 banana candies. What is the least possible number of apple candies? In the picture A means apple and B means banana.
Henry cycles to school. Halfway there, he finds that keeping the same speed would make him 5 minutes late. He doubles his speed for the remaining half and arrives 7 minutes early. How many minutes does his actual journey take?
The graph shows Clover’s distance from home. She visits a grocery store, then a park, returns towards her grandparents’ house when it rains, then cycles to a bookstore and home. Her average speed over the whole trip is 8 km/h. How long does she stay at her grandparents’ house? Chart axes: distance from home in km; time in minutes.
Route convention: each moving section follows a direct route towards or away from home, so travelled distance is the change in the plotted distance.
A cubic tank has side 15 cm and water depth 10 cm. Identical bricks measure 7 cm× 3 cm× 3 cm. At most how many bricks can be put fully under the water without overflow?
Model convention: bricks are solid and non-absorbent; displaced volume equals submerged brick volume.
A 6 cm× 18 cm rectangular sheet is folded so that two opposite vertices coincide, as shown. Find the area occupied by the folded paper, counting overlaps only once.
The map has 12 intersections. People at intersections can see all other occupied intersections on the same straight street. For example,I8 can see I2,I4,I5,I7,I9,I11. Amy,Ben,Clover,Dan,Elsa,Fred occupy six different intersections.
- Dan,Amy,Fred are the vertices of a triangle made of three street segments.
- Dan sees only Amy and Fred.
- Elsa sees only Amy and Clover.
- Amy sees Ben at the next intersection beyond Fred on the same street.
- Clover cannot see Ben or Fred.
- Nobody occupies I10.