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tomtom7243
27.08.2019 •
Mathematics
If today's uv index is,8 erin will burn in 15 minutes without sunscreen. if erin puts on lotion with an sp of 25,how long will she be protected?
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Ответ:
they sell 240 sw =)))
Step-by-step explanation:
x= the number of b water they sold
y= the number of sw they sold
because they sold a total of 390 items => x+y= 390 (1)
because they sold water for $2 a bottle and the sandwiches for $4 each => 2x + 4y= 1260 (2)
(1) and (2) => x=150 ; y=240.
i hope this will help you =)))