mattiemattoos
21.04.2020 •
Mathematics
Tom and adam have a total of 240 stamps.The ratio of the number of tom's stamps to adam's is 3:7.Tom buys some stamps from Adam.The ratio of tom's stamp to adam's is now 3:5.How many stamps does tom buy from adam
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Ответ:
18
Step-by-step explanation:
In both cases, the number remains constant, 240 stamps.
Given that 3:7 is equal to 3/10 to 7/10
Initially, Tom had 3/10*240=72 stamps
Finally, 3:5 equal to 3/8 to 5/8
Tom has 3/8*240=90 stamps
Difference is 90-72=18 stamps
Therefore, Tom bought 18 stamps from Adam and Adam didn't replace
Ответ:
31+4
21
=28+3+2
4×21
=(
28
)
2
+(
3
)
2
+2
28
×
3
=(
28
+
3
)
2
Using (a+b)
2
=a
2
+b
2
+2ab
31+4
21
=(
28
+
3
)
2
∴
31+4
21
=(
28
+
3
)
The square root of
31+4
21
is (
28
+
3
)