Question 5The first two scales balance. How many diamonds (black diamond symbols) must replace the question mark so that the third scale balances?
Question 7The first two scales balance. How many up arrows must replace the question mark so that the third scale balances?
Question 16The four triangles are linked by a simple formula. Which triangle is the odd one out? ABCD
Question 20Which number replaces the question mark so that wheel C follows the rule of the other wheels?