lily539711
18.10.2020 •
Mathematics
Which are correct representations of the inequality - 3(2x-5) <5(2 - x)? Select two options.
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Ответ:
We know that Maggie's brother is 5 years younger than three times her age.So, we can write:
Y=3*M-5 (1)
We also know that the sum of their ages is 51, so we can write:
Y+M=51 (2)
We can put the first equation (1) in the second (2) and we will obtain:
3M-5+M=51
4M-5=51
4M=51+5
4M=56
M=56/4
M=14
Maggie is 14 years old.
And her brother is : Y=51-14=34 years old.