Tipping the Scales

Question:
The top two scales are in perfect balance. How many diamonds will be needed to balance the bottom set?

This puzzle works your executive functions in your frontal lobes by using your pattern recognition, hypothesis testing, and logic.
ANSWER:

Four diamonds

SOLUTION:

First add up the number of clubs in the first two scales (5). Then count how many clubs are in the bottom scale (5). The do the same with the spades, which gets you 5 and 5. There are 4 diamonds in the top two balanced scales. Therefore, it must take 4 diamonds to balance the third scale since all the other measurements are the same.