The word(s) "why" appears 48 time(s) in 45 verse(s) in Quran in Muhammad Pickthal translation.

(11) Hast thou not seen those unto whom it was said: Withhold your hands, establish worship and pay the poordue, but when fighting was prescribed for them behold! a party of them fear mankind even as their fear of Allah or with greater fear, and say: Our Lord! why hast Thou ordained fighting for us? If only Thou wouldst give us respite yet a while! Say (unto them, O Muhammad): The comfort of this world is scant; the Hereafter will be better for him who wardeth off (evil); and ye will not be wronged the down upon a date-stone.

(12) The Jews and Christians say: We are sons of Allah and His loved ones. Say: why then doth He chastise you for your sins? Nay, ye are but mortals of His creating. He forgiveth whom He will, and chastiseth whom He will. Allah's is the Sovereignty of the heavens and the earth and all that is between them, and unto Him is the journeying.

(13) why do not the rabbis and the priests forbid their evil-speaking and their devouring of illicit gain? Verily evil is their handiwork.

(14) They say: why hath not an angel been sent down unto him? If We sent down an angel, then the matter would be judged; no further time would be allowed them (for reflection).

(15) They say: why hath no portent been sent down upon him from his Lord? Say: Lo! Allah is Able to send down a portent. But most of them know not.

(16) And when a community among them said: why preach ye to a folk whom Allah is about to destroy or punish with an awful doom, they said: In order to be free from guilt before your Lord, and that haply they may ward off (evil).

(17) And when thou bringest not a verse for them they say: why hast thou not chosen it? Say: I follow only that which is inspired in me from my Lord. This (Qur'an) is insight from your Lord, and a guidance and a mercy for a people that believe.

(18) A likely thing, that thou wouldst forsake aught of that which hath been revealed unto thee, and that thy breast should be straitened for it, because they say: why hath not a treasure been sent down for him, or an angel come with him? Thou art but a warner, and Allah is in charge of all things.

(19) They said: O our father! why wilt thou not trust us with Joseph, when lo! we are good friends to him?

(20) why bringest thou not angels unto us, if thou art of the truthful?