If ab-2cd = p; 6cd-3ab=1; what is the value of p?

If ab-2cd = p; 6cd-3ab=1; what is the value of p? Correct Answer -1/3

Given That ,             6cd - 3ab = 1       ⇒ 3(2cd - ab) = 1       ⇒ 2cd - ab = 13   another equation is,          ab - 2cd = p      ⇒ -1(2cd - ab)= p     ⇒ -13 = p               (putting the value of 2cd - ab) Ans: P = -13               
Bissoy MCQ

Related Questions

The assessed value of a house is $72,000. The assessed value is 60% of the market value of the house. If taxes are $3 for every $1,000 of the market value of the house, how much are the taxes on the house?
In 2000, the book value of a car was 2/3rd of the original purchase price, and in 2004, its book value was 1/2 of the original purchase price. By what percentage did the value of the car decrease from 2000 to 2004.
For some value of x , 5(x+2) =y . After the value of x is increased by ,3 5(x+2) =z. what is the value of (z -y) ?
In January, the value of a stock increased by 25%, and in February, it decreased by 20%.How did the value of the stock at the end of February compare with its value at the beginning of January?
The value of machine is TK.6250. Its value decreases by 10% during the first year, 20% during second year and 30% during the third year. What will be the value of the machine after 3 years?
A Collection of 16 coins,each with a face value of either 10 paisa or 25 paisa, has a total face value of Tk. 2.35 How many of the coins have a face value of 25 paisa?
A collection o 16 coins , each with a face value either 10 paisa or 25 paisa, has a total face value of Tk. 2.35. How many of the coins have a face value of 25 paisa/
The value of "A" varies in inverse proportion as the square of "B". If the value of "A" is equal to 40 , when "B" is equal to 12. What would be the value of "A" when "B" is equal to 24?
The value of 10 pounds of gold is d dollars, and a pound of gold has the same value as p pounds of silver. what i the value, in dollars of one pound of silver?
A stock decreases in value by 25%. By what percent must the value of that stock increase to reach its former value ?