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 C, B, A and D are thrown in turn and Figure 1 becomes Figure 2. One switch is not working. Which one?
At the end of the day one market stall had 16 apples and 48 oranges left. Another market stall had 36 apples and 24 oranges left. What is the difference, in percentage points, between the percentages of apples left at the two stalls? Answer with a natural number.
The letters A B C D E F G H are written in a row. What letter is immediately to the left of the letter which is two to the left of the letter that comes midway between the letter two to the right of the letter F and the letter two to the left of the letter D?
Her novels reflect her background, highly allusive and ___ in style, they draw their characters from academic and artistic works. Which word belongs in the gap?
Which square should replace the question mark? (Each row shows two squares of dots combined into a third.) Choose from the options labelled in the figure.
Which is the missing section? (A grid of squares made of horizontal and vertical lines, with one section missing.) Choose from the options labelled in the figure.
Each set of nine numbers relates to the other in a certain way. Work out the logic of the left-hand box to find the missing number in the right-hand box. 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 D, C, B and A are thrown in turn and Figure 1 becomes Figure 2. One switch is not working. Which one?
What is the value of angle X, in degrees? (Two triangles overlap; a 35 degree angle, an unknown angle Y, a right angle Z and angles W and X are marked.) Answer with a natural number.
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.
Which figure completes the analogy? (A small square split into four symbols is to a cross with the symbols on its arms, as a second square is to which of options A to G?) Choose from the options labelled in the figure.
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 A, D, B and C are thrown in turn and Figure 1 becomes Figure 2. One switch is not working. Which one?
7952 : 1211 : 23. Which set of numbers has the same relationship to each other as the numbers above? 3482 : 2408 : 16; 3496 : 1254 : 39; 8278 : 1510 : 25; 8217 : 9090 : 99; 9487 : 1612 : 37
