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AshIeigh
06.08.2019 •
Mathematics
The sun of three numbers is 98. if the ratio of the first to second is 2: 3 and that of the second to the third is 5: 8; then the second number is
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Ответ:
30
Step-by-step explanation:
solve the system of equations:
a+b+c=98,
a/b=2/3,
b/c=5/8
so
a + 3/2 a + 3/2 * 8/5 a = 98
49/10 a = 98
a = 980/49 = 20
then b = 3/2 * 20 = 30
(and c = 48)
Ответ:
Explanation: 10 x 25 = 250+250 = 500
20x25= 500