**Answer :**

**Suppose the percentage of**

16 | |

X in given sample = x | |

8 |

*:.*The percentage of

18 | |

X in given sample = 100-x | |

8 |

**As given average atomic mass of a sample of an element X = 16.2 u**

=> (16 × x /100) + [18 × (100-x) /100] = 16.2

=> (16x + 1800-18x) / 100 = 16.2

=> (16x + 1800-18x) = 16.2 × 100

=> -2x + 1800 = 1620

=> -2x = 1620-1800

= -2x = -180

=> x = 90

*:.*The percentage of

16 | |

X in given sample = x = 90 | |

8 |

*:.*The percentage of16 | |

X in given sample = 100-x =100-90 = 10 | |

8 |

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