Which symbol is missing? (A row of symbols follows a pattern with gaps marked ?, followed by options A to E.) Choose from the options labelled in the figure.
Which set of symbols should replace the question marks? (Two sets of six circles are shown; the second set has hidden results.) Choose from the options labelled in the figure.
The top set of six numbers has a relationship to the set of six numbers below. The two sets on the left have the same relationship as the two sets on the right. Which set of numbers replaces the question marks? Choose from the options labelled in the figure.
A marble statue is carved by a sculptor. In the first week 35% is cut away, in the second week 20% of the remainder is cut away and in the third week 25% of the remainder is cut away and polished to produce the final statue. The final statue weighs 48.75 lb. What was the weight of the original block of marble, in pounds? Answer with a natural number.
In a game of eight players lasting 90 minutes, four reserves alternate equally with each player, so that all twelve people are on the pitch for exactly the same length of time. For how many minutes is each person on the pitch? Answer with a natural number.
An electrical circuit wiring four lights depends on switches A, B, C and D. A toggles lights 1 and 2, B toggles lights 2 and 4, C toggles lights 1 and 3, D toggles lights 3 and 4 (on becomes off and off becomes on). Switches B, A, C and D are thrown in turn and Figure 1 becomes Figure 2. One switch is not working. Which one?
The letters A B C D E F G H are written in a row. What letter is immediately to the right of the letter which comes four to the left of the letter that comes midway between the letter immediately to the right of the letter B and the letter immediately to the left of the letter H?