Question

"A"kisi kam ko din 9 me ."B" kisi kam ko 12 din me samapt karta hai to (alternative)para pari kam kar ke dono kitne din me samapt karenge

Answer 1

$\frac{a \times b}{a + b} = \frac{9 \times 12}{9 + 12} = \frac{180}{31} = 5 \times \frac{25}{31} \: days$