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finlchey3860
25.11.2019 •
Mathematics
Abag contains white marbles and red marbles, 20 in total. the number of white marbles is 5 more than 2 times the number of red marbles. how many white marbles are there?
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Ответ:
15
Step-by-step explanation:
let r represent red marbles then white = 2r + 5 and total is 20, thus
r + 2r + 5 = 20 ( subtract 5 from both sides )
3r = 15 ( divide both sides by 3 )
r = 5 ← number of red marbles
Thus number of white = 20 - 5 = 15
Ответ:
D
Step-by-step explanation:
The number of sides increase by 1 each time