Homework Help: Mathematics

Posted by Envy Green on Saturday, May 14, 2011 at 6:20am.

Q1.A man earn $1200 and spends $450 per month.Find ratio of
(a)His income to his expenditure and
(b)His savings to his income

Q2.An open water tank with length 20 cm and width 15 cm holds 4.8 liters of water.calculate the height of the water level tank and the total surface area of he cuboid in the contact with the water.

Q3.A car uses 40 liters of petrol to travel 340 km. how far can it travel if it has only 32 liters of petrol?

Mathematics - drwls, Saturday, May 14, 2011 at 6:39am
Q1: (a) 1200/450 = ?
(b) (1200-450)/1200 = ?

Q2: Water Volume = 20*15*H = 4800 cm^3
Solve for the water height H (in cm)
H = 4800/300 = ___

What is a "he cuboid"? Do you mean the tank area in contact with water? You can certainly do that.

Q3: (32/40)*340 = ___ km
Mathematics - drwls, Saturday, May 14, 2011 at 6:44am
According to Wikipedia, one definition of cuboid is:
".., the word “cuboid” is sometimes used to refer to a shape ... in which each of the faces is a rectangle (and so each pair of adjacent faces meets in a right angle); this... type of cuboid is also known as a right cuboid, rectangular box, rectangular hexahedron, right rectangular prism, or rectangular parallelepiped."

I was taught to call it a rectangular prism.

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