Challenge question #53 (19/06/2017)
Junior Question
The petrol tank in Jim’s car is $\tfrac{2}{3}$ full. He drove to his friend’s house and used $2$ litres of petrol. The petrol tank is now $\tfrac{5}{8}$ full.
How many litres does the petrol tank hold when full?
Senior Question
$5$
$23$
In the grid alongside, the blank squares must be filled in such that the number in each blank square is the average of the numbers in its adjacent squares.
What number must be filled in the shaded blank square?
