Question

please answer question no 9​

Answer 1

$let \: c \: has \: x \: rupees \\ and \: d \: has \: y \: rupees \\ according \: to \: question \\ 2x + x + y + 3y = 290 \\ 3x + 4y = 290.....1 \\ 2x - (x + y) = 50 \\ x - y = 50...........2 \\ solving \: eqution \: 1 \: and \: second \\ \: we \: get \\ 7x = 490 \\ x = 70 \: \: so \: y = 20 \\ c \: has \: 70 \: rupees \\ a \: has \: 140 \: rs \\ d \: has \: 20rs \\ b \: has \: 60 \: rs$