mathematics and earthquake

earthquake which happend in Yogyakarta about five years ago made a lot of victims. More than one hundred thousand people were dead, and more than one thousand houses were broken. Goverment help the victim of Earthquake in Yogyakarta by a lot of way. One of them is give the victims money to build up again their home. If a home can finished about sixty days with twelve bricklayers. Because something reason, a home have to finish for fourty days. How many bricklayers have to seek to make a home?


how to solve this problem??




to solve this problem, we need mathematics. We knoe that a home can be finish about sixty days with twelve bricklayers. But, we must finish a home for fourty days. To solve this problem, we use the way:




days bricklayers
1. 60 12
2. 40 x

the multiplisation days (1) equals to days (2)


so


60 . 12 = 40 . x

x= 60.12/40
by cancel out sixty and fourty, we find that x equals to one point five times twelve


So, x=1,5 . 12
x= 18


that is the last of equality (x=18). So, a home have to finish for 40 days with 18 bricklayers. We have twelve bricklayers. So, we must find six bricklayers again to help twelve bricklayers the other. That us all, so simple and interesting. It is because mathematics.