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15-men-can-complete-a-work-in-10-days-working-8-hrs-per-day-How-many-persons-are-required-to-complete-double-the-work-in-25-days-working-6-hrs-per-day-




Question Number 99358 by PengagumRahasiamu last updated on 20/Jun/20
15 men can complete a work in 10 days,  working 8 hrs. per day. How many  persons are required to complete  double the work in 25 days, working  6 hrs. per day?
$$\mathrm{15}\:\mathrm{men}\:\mathrm{can}\:\mathrm{complete}\:\mathrm{a}\:\mathrm{work}\:\mathrm{in}\:\mathrm{10}\:\mathrm{days}, \\ $$$$\mathrm{working}\:\mathrm{8}\:\mathrm{hrs}.\:\mathrm{per}\:\mathrm{day}.\:\mathrm{How}\:\mathrm{many} \\ $$$$\mathrm{persons}\:\mathrm{are}\:\mathrm{required}\:\mathrm{to}\:\mathrm{complete} \\ $$$$\mathrm{double}\:\mathrm{the}\:\mathrm{work}\:\mathrm{in}\:\mathrm{25}\:\mathrm{days},\:\mathrm{working} \\ $$$$\mathrm{6}\:\mathrm{hrs}.\:\mathrm{per}\:\mathrm{day}? \\ $$
Commented by john santu last updated on 20/Jun/20
16 persons
$$\mathrm{16}\:\mathrm{persons} \\ $$
Answered by john santu last updated on 20/Jun/20
⇒15 × 8 × 10 = 1 work   ⇒ t × 6 × 25 = 2 work   ⇔(15×8×10)×2 = t × 6 × 25   t = ((150 × 16)/(150)) = 16 persons
$$\Rightarrow\mathrm{15}\:×\:\mathrm{8}\:×\:\mathrm{10}\:=\:\mathrm{1}\:\mathrm{work}\: \\ $$$$\Rightarrow\:\mathrm{t}\:×\:\mathrm{6}\:×\:\mathrm{25}\:=\:\mathrm{2}\:\mathrm{work}\: \\ $$$$\Leftrightarrow\left(\mathrm{15}×\mathrm{8}×\mathrm{10}\right)×\mathrm{2}\:=\:\mathrm{t}\:×\:\mathrm{6}\:×\:\mathrm{25}\: \\ $$$$\mathrm{t}\:=\:\frac{\mathrm{150}\:×\:\mathrm{16}}{\mathrm{150}}\:=\:\mathrm{16}\:\mathrm{persons}\: \\ $$

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