Thomas stopped by a road to wait for a friend. He first saw the light turn red at 12:50. It turned red again every 100 seconds. If he left just after 13:20, how many red lights did he see?
Eighteen people were expected to repair a road in 8 days. Six more people join the work. How many days will the repair take, assuming everyone has the same productivity?
Fermat school has 5 grades, with an average of 300 students per grade. Camellia drew the bar graph below, but the numerical scale was erased. Find the number of grade 2 students.
A library has 96 Literature and Science books in total. A librarian mistakenly put 5 Literature books on the Science shelf, after which that shelf held three times as many books as the Literature shelf. How many Science books are there?
In the morning a petrol station sold half its original petrol and 500 litres more. In the afternoon it sold two thirds of the remaining petrol and 400 litres more. Finally 800 litres remained. How many litres were there originally?
Josh made a rectangle from two square sheets of side 10 cm. John then placed the green sheet over part of the yellow sheet to make a new rectangle, decreasing the area by 30 cm². Find the perimeter of John’s rectangle.
Emily has 18 pink, 21 yellow, 27 orange and 25 purple gummy bears. She draws candies without looking. At least how many must she draw to guarantee 3 yellow candies and 9 purple candies?
In a magic square, every row, column and diagonal has the same sum. Find the number in the cell marked with a question mark in the 3 by 3 magic square below.