Question

. Given that 10% of A's income = 15
of B's income = 20% of C's incom
If sum of their income is Rs. 780
then B's income is :​

Answer 1

Step-by-step explanation:

$let \: the \: income \: of \: c = x \\ then \: income \: of \: b = 20\%of \: c \\ = \frac{20}{100} x = \frac{x}{5} \\ now \: icome \: of \: a = 15\%of \: b \\ = \frac{15}{100} b = \frac{3}{20} \times \frac{x}{5} = \frac{3x}{100} \\ according \: to \: question \\ sum \: of \: income = 780 \\ = > x + \frac{x}{5} + \frac{3x}{100} = 780 \\ = > \frac{100x + 20x + 3x}{100} = 780 \\ = > 123x = 78000 \\ = > x = \frac{78000}{123} \\ = > x = 634.146(approx.)$

therefore income of b=X/5=634.146/5

B's income=126.82(approximately)