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Showing posts with label Simple Equations. Show all posts
Showing posts with label Simple Equations. Show all posts
Wednesday, July 24, 2013
Saturday, July 20, 2013
tougher problems in simple equation
A car did a journey in "t" hours. If the average speed had been "m" km/hr greater, the journey would have taken "y" hours less. What was the length of the journey?
tougher problems on simple equations
A fraction is such that if "c" is added to the numerator and "d" to the denominator, the value of the fraction becomes 1/x. If the numerator of the original fraction is doubled and the denominator is increased by "e", the fraction becomes 1/y. Find the original fraction.
tougher questions on simple equation
A man rides one third of the distance from A to B at the rate of "a" km/hr and the remainder at "2b" km/hr. if he had traveled at the uniform rate of "3c" km/hr, he could have ridden from A to B and back again in the same time.
Prove that 2/c = (1/a) + (1/b)
Prove that 2/c = (1/a) + (1/b)
tougher problems on simple equation
There are two mixtures of acid and water, one of which contains twice as much water as acid, and the other three times as much acid as water. How much must be taken from each in order to fill a liter measure, in which the water and the acid shall be equally mixed?
Simple Equation
A man bicycles half the distance from one town to the another at 24 km/hr, and the other half at 16 km/hr. A second man bicycles all the way at 22.5 km/hr. If the difference in the time taken is 5 1/2 min, then what is the whole distance?
Friday, July 19, 2013
framing of equation
A man buys oranges at the rate of "p" for a $, and by selling them at "q" cents a dozen makes a profit of "r" %.
Show that pq -12r = 1200
Answer:
Cost of 12 oranges = 12/p
Selling price of 12 oranges = q/100
Gain = q/100 - 12/p = (pq - 1200)/100p
Gain % = r = 100 [(pq - 1200)/100p] / 12/p
or, 12r = 100p [(pq - 1200)/100p]
or, 12r = pq - 1200
or, pq - 12r = 1200
Show that pq -12r = 1200
Answer:
Cost of 12 oranges = 12/p
Selling price of 12 oranges = q/100
Gain = q/100 - 12/p = (pq - 1200)/100p
Gain % = r = 100 [(pq - 1200)/100p] / 12/p
or, 12r = 100p [(pq - 1200)/100p]
or, 12r = pq - 1200
or, pq - 12r = 1200
Wednesday, July 17, 2013
mixtures, STD V
A, B and C have $ 507 between them. B and C together have $
345 and C and A together have $ 305. How much does C have?
Answer:
A+B+C =507--------(1)
B+C = 345----------(2)
A+C = 305----------(3)
Adding (2) and (3), we get A+2B+C = 345 + 305------(4)
Substituting (1) in (4), we get
507 + B = 650
Or, B = 143
Therefore, C = 345 – 143 = 202
A Sum of money is divided into A, B and C. C gets twice as
much as A, A and B together get $70, and B and C together get $90. How much
does each person get?
Answer:
2A = C -------(1)
A + B = 70------(2)
B +C = 90-------(3)
(2) – (3)
A – C = -20,-----(4)
Substituting (1) in (4), we get
A – 2A = -20
Or, A = 20, therefore B = 50 and C = 40
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