Question

slove this question.......................

Answer 1

$a = 100 \\ c.d = x \\ s12 = 5 \times s6 \\ \frac{12}{2}(2a + 11d) = 5 \times \frac{6}{2} (2a + 5d) \\2( 2a + 11d) = 5(2a + 5d) \\ 6a = 12d \\ d = \frac{a}{2} = \frac{100}{2} = 50$