Every pair of numbers in this row follows the same rule. What rule do the first two pairs follow? Choose the answer that will make the third pair follow the same rule as the first two pairs.[28 → 4] [21 → 3] [35 → ?]

The most current version of the Cognitive Ability Test is the CogAT Form 7. Level 11 of this version contains 176 questions which are separated into three batteries (Verbal, Quantitative and Nonverbal) each consisting of three subtests for a total of nine question types. Children are allotted approximately two and a half hours to complete the test.

The sample test below contains ten practice questions for the CogAT Level 11. (The selection covers all question types found on the Form 7 tests).