A restaurant sold 250 drinks in a night. Some of the drinks were sold for $2 each, and the rest for $5 each. If the total sales of drinks fo

Question

A restaurant sold 250 drinks in a night. Some of the drinks were sold for $2 each, and the rest for $5 each. If the total sales of drinks for the night was $830, how many $2 drinks were sold?

110
140
145
150
155

?

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Nguyệt Ánh 4 years 2021-07-17T16:18:35+00:00 1 Answers 301 views 1

Answers ( )

  1. Vodka
    1
    2021-07-17T16:19:40+00:00
    Reply

    Answer:

    140

    Step-by-step explanation:

    Suppose,

    x drinks were sold for 2$

    y drinks were sold for 5$

    therefore, x+y = 250….( 1 )

    and 2x+5y = 830……( 2 )

    multiply equation ( 1 ) with 2,

    2x+2y = 500……( 3 )

    Subtract equation ( 3) from (2)

    3y = 330

    or, y = 110

    so, x = 140

    so, 140 drinks were sold for 2$

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )