One ghusl is sufficient with the intention of doing ghusl both for Jumu’ah and to remove janaabah
Question

                If a person has two ghusls to do, the ghusl to remove janaabah and the ghusl for Jumu’ah, what should he do with regard to the intention and the number of ghusls he has to do?.
Praise be to Allah.
    If a person has to do both the ghusl for removing janaabah 
    and the ghusl for Jumu’ah, it is sufficient for him to do one ghusl for both 
    purposes, and he should intend to do ghusl both to remove janaabah and for 
    Jumu’ah, because the Prophet  (peace and blessings of Allaah be upon 
    him) said: “Actions are but by intentions, and each person will have but 
    that which he intended.” Narrated by al-Bukhaari (1) and Muslim (1907). 

    Al-Nawawi said in al-Majmoo’ (1/368): 

    If he intended when doing ghusl to do ghusl to remove 
    janaabah and for Jumu’ah, then both are achieved (in one ghusl). This is the 
    correct view. End quote.

    Ibn Qudaamah (may Allaah have mercy on him) said: 

    If he does one ghusl for Jumu’ah and to remove janaabah, and 
    he intends both, that is sufficient, and we do not know of any difference of 
    opinion on this matter. End quote. 

    Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him) 
    was asked: Does ghusl to remove janaabah also count for ghusl for Jumu'ah? 
    He replied:  

    If it is done during the day, that is sufficient for him, but 
    it is better for him to intend both, by intending when doing ghusl that it 
    is for Jumu’ah and for janaabah. Thus he will also attain, in sha Allaah, 
    the virtue of doing ghusl for Jumu’ah too. End quote. 

    Majmoo’ Fataawa Ibn Baaz 
    (12/406). 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was 
    asked: What is the ruling on combining ghusl for Jumu’ah and ghusl to remove 
    janaabah? He replied: 

    There is nothing wrong with that, because if a person is 
    junub and he does ghusl, intending thereby to remove the janaabah and also 
    do ghusl for Jumu’ah, there is nothing wrong with that, just as if a person 
    enters the mosque and prays two rak’ahs intending it to be both the regular 
    Sunnah prayer and greeting the mosque, there is nothing wrong with that. 

    One of the following scenarios must apply: 

    1 – He intends to do ghusl to remove janaabah only.

    2 – He intends to do ghusl both to remove janaabah and for 
    Jumu’ah.

    3 – He intends to do ghusl for Jumu’ah only. 

    There is a fourth scenario which is unlikely, where he 
    intends neither.  

    If he intends to do ghusl to remove janaabah, that is 
    sufficient and he does not need to do ghusl for Jumu’ah if it is after 
    sunrise, but if he intends both that is sufficient and he will attain the 
    reward for both. If he intends to do ghusl for Jumu’ah, that is not 
    sufficient and he still has to do ghusl to remove janaabah, because ghusl 
    for jumu’ah is required even when one is not impure but ghusl to remove 
    janaabah is required when one is impure, so it is essential to have the 
    intention of removing this impurity. Some of the scholars said that he 
    should do ghusl twice, but this is not a sound view. End quote. 

    Majmoo Fataawa Ibn ‘Uthaymeen 
    (16/137). 

    And Allaah knows best.