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a-b-c-5-6-7-3a-4b-5c-16-faind-volue-of-c-




Question Number 170065 by mathlove last updated on 15/May/22
a:b:c=5:6:7  3a+4b−5c=16        faind volue of    c=?
$${a}:{b}:{c}=\mathrm{5}:\mathrm{6}:\mathrm{7} \\ $$$$\mathrm{3}{a}+\mathrm{4}{b}−\mathrm{5}{c}=\mathrm{16}\:\:\:\:\:\: \\ $$$${faind}\:{volue}\:{of}\:\:\:\:{c}=? \\ $$
Answered by Rasheed.Sindhi last updated on 15/May/22
a=5k, b=6k, c=7k  3a+4b−5c=16        ⇒3(5k)+4(6k)−5(7k)=16       15k+24k−35k=16       4k=16⇒k=4      c=7k=7×4=28
$${a}=\mathrm{5}{k},\:{b}=\mathrm{6}{k},\:{c}=\mathrm{7}{k} \\ $$$$\mathrm{3}{a}+\mathrm{4}{b}−\mathrm{5}{c}=\mathrm{16}\:\:\:\:\:\: \\ $$$$\Rightarrow\mathrm{3}\left(\mathrm{5}{k}\right)+\mathrm{4}\left(\mathrm{6}{k}\right)−\mathrm{5}\left(\mathrm{7}{k}\right)=\mathrm{16} \\ $$$$\:\:\:\:\:\mathrm{15}{k}+\mathrm{24}{k}−\mathrm{35}{k}=\mathrm{16} \\ $$$$\:\:\:\:\:\mathrm{4}{k}=\mathrm{16}\Rightarrow{k}=\mathrm{4} \\ $$$$\:\:\:\:{c}=\mathrm{7}{k}=\mathrm{7}×\mathrm{4}=\mathrm{28} \\ $$

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