Fractions and Percentages

The ppm of 1.23% is 12,300 ppm.

The human body contains 70% of water.

Five percent of sulphur is used in the cross-linking of natural rubber which is also called as vulcanization.

It is correct answer.Solution :Let the no. be x.

Then the correct answer is 4x.

The incorrect value obtained is x/4.

The required % = ((x/4)/4x) * 100 = 6.25%

It is correct answer.Solution: Total Seats = cSeats in front section = a (i.e 1/5*c)a = c/5 Seats sold in front section = 5/6*a = (5/6*c/5) = c/6Seats unsold in front section = c/5 - c/6 = c/30Total seats sold = 3/4*cTotal seats unsold = c/4Fraction of seats unsold in front section = 2c/15

Amount of C = 8 * 65,000/26 = 20,000 % amount = 20,000 * 100/65,000 = 30.77%

Let original fraction is n/p.

The new fraction = 3n/4p = 0.75 * n/p

Therefore, it is 75% of original fraction.

7%2 = 7² + 2² - (7)(2) 7%2 = 49 + 4 - 14 7%2 = 53 - 14 7%2 = 39  

Let the original fraction be n/p. Then, according to the question, (0.75*n)/(2.5*p) = 9/20 n/p = 3/2

Let the original number be X. Then (20 * 25 * X)/(100 * 100) = 100X = 2000 So, the required number = 24 * 2000/100 = 480.

Let the number be X. Then according to the question, X - (X * 36/100) = 16 X * 64/100 = 16 X = 25

Let the original fraction be a/b. The equation becomes (6 * a)/(1.5 * b) = 3/2 a/b = 3/8

Let the number be X. Then (X * 55 * 20)/(100 * 100) = 1100 X = 10000

Answer = (2 * 180/5) - (120/6) = 72 - 20 = 52

Let the original fraction be a/b. Then according to the question, (a + a * 250/100)/(b - b * 50/100) = 4/5 (3.5 * a)/(0.5 * b) = 4/5 a/b = 4/35