Question

DIS
If A:B = 3:7 and A + B = 210 then the difference
between A and B is
a) 4
1884
c) 48
W None of these
IF Moto
005​

Answer 1

Answer:

A+B=210

A=210x3/10=63

B =210x7 / 10 =147

B-A=147-63=84

Answer 2

Answer:

a=210-b

$\frac{210 - b}{b} = \frac{3}{7} \\ 1470 - 7b = 3b \\ 10b = 1470 \\ b = 147 \\ a + b = 210 \\ a = 210 - 147 = 63 \\ a - b = 63 - 147 = - 84$