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teckadeck
19.08.2019 •
Mathematics
Joan likes to watch the birds in her yard. one morning she notices that there are twice as many robins as bluejays. if she counted 21 bluejays and robins in all, how many bluejays did she count
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Ответ:
=> the number of Robins is twice as bluejay
=> Robins = 2X
=> The number of bluejay is about to know:
=> Bluejay = X
The total number of birds is 21.
=> 2X + X = 21
=> 3x = 21
=> 3x / 3 = 21 / 3
=> x = 7
Thus the number of bluejay is 7
=> Robin = 2(7)
=> Robin = 14
Thus the number of Robin is 14
Ответ:
32%
Step-by-step explanation:
percent increase = $330-$250 =80
80/250 ×100 = 32%