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Question Number 16983 by aamaguestt last updated on 29/Jun/17
If 15 men or 24 women or 36 boys do a   piece of work in 12 days, working 8 hours  a day, how many men must associated  with 12 women and 6 boys to do another  piece of work 2(1/4) times as great in 30  days working 6 hrs a day?
$$\mathrm{If}\:\mathrm{15}\:\mathrm{men}\:\mathrm{or}\:\mathrm{24}\:\mathrm{women}\:\mathrm{or}\:\mathrm{36}\:\mathrm{boys}\:\mathrm{do}\:\mathrm{a}\: \\ $$$$\mathrm{piece}\:\mathrm{of}\:\mathrm{work}\:\mathrm{in}\:\mathrm{12}\:\mathrm{days},\:\mathrm{working}\:\mathrm{8}\:\mathrm{hours} \\ $$$$\mathrm{a}\:\mathrm{day},\:\mathrm{how}\:\mathrm{many}\:\mathrm{men}\:\mathrm{must}\:\mathrm{associated} \\ $$$$\mathrm{with}\:\mathrm{12}\:\mathrm{women}\:\mathrm{and}\:\mathrm{6}\:\mathrm{boys}\:\mathrm{to}\:\mathrm{do}\:\mathrm{another} \\ $$$$\mathrm{piece}\:\mathrm{of}\:\mathrm{work}\:\mathrm{2}\frac{\mathrm{1}}{\mathrm{4}}\:\mathrm{times}\:\mathrm{as}\:\mathrm{great}\:\mathrm{in}\:\mathrm{30} \\ $$$$\mathrm{days}\:\mathrm{working}\:\mathrm{6}\:\mathrm{hrs}\:\mathrm{a}\:\mathrm{day}? \\ $$
Answered by ajfour last updated on 29/Jun/17
(15M=24W=36B)×96h=1J  (xM+12W+6B)×180h=2(1/4)J  (xM+((15)/2)M+((15)/6)M)×180h=(9/4)J  (x+10)M×180h=(9/4)×15M×96h       x+10 = ((9×15×96)/(4×180)) = 18                x = 8     8 Men should assist..
$$\left(\mathrm{15M}=\mathrm{24W}=\mathrm{36B}\right)×\mathrm{96h}=\mathrm{1J} \\ $$$$\left(\mathrm{xM}+\mathrm{12W}+\mathrm{6B}\right)×\mathrm{180h}=\mathrm{2}\frac{\mathrm{1}}{\mathrm{4}}\mathrm{J} \\ $$$$\left(\mathrm{xM}+\frac{\mathrm{15}}{\mathrm{2}}\mathrm{M}+\frac{\mathrm{15}}{\mathrm{6}}\mathrm{M}\right)×\mathrm{180h}=\frac{\mathrm{9}}{\mathrm{4}}\mathrm{J} \\ $$$$\left(\mathrm{x}+\mathrm{10}\right)\mathrm{M}×\mathrm{180h}=\frac{\mathrm{9}}{\mathrm{4}}×\mathrm{15M}×\mathrm{96h} \\ $$$$\:\:\:\:\:\mathrm{x}+\mathrm{10}\:=\:\frac{\mathrm{9}×\mathrm{15}×\mathrm{96}}{\mathrm{4}×\mathrm{180}}\:=\:\mathrm{18} \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\mathrm{x}\:=\:\mathrm{8}\: \\ $$$$\:\:\mathrm{8}\:\boldsymbol{\mathrm{M}}\mathrm{en}\:\mathrm{should}\:\mathrm{assist}.. \\ $$
Commented by aamaguestt last updated on 29/Jun/17
I did like this but the answer in   the app is different
$${I}\:{did}\:{like}\:{this}\:{but}\:{the}\:{answer}\:{in}\: \\ $$$${the}\:{app}\:{is}\:{different} \\ $$

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