Look at this series: 664, 332, 340, 170, __, 89,… What number should fill the blank?

a. |
85 |

b. |
97 |

c. |
109 |

d. |
178 |

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Look at this series: 664, 332, 340, 170, __, 89,… What number should fill the blank?

a. |
85 |

b. |
97 |

c. |
109 |

d. |
178 |

Test ID: 578

Source: 501 challenging logic & reasoning problems

d. This is an alternating division and addition series: First, divide by 2, and then add 8.