• # question_answer In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there are Rs. 30 in all, how many 5 p coins are there? A) 50                                B) 100C) 150                              D) 200

Let the coins are 25 paise. 10 paise and 5 p? are x, 1x and 3x respectively. $x\times 0.25+2x\times 0.10+3x\times 0.05=30$ $\Rightarrow$   $0.25x+0.20x+0.15x=30$ $\Rightarrow$   $0.60x=30$ $\therefore$      $x=\frac{30}{0.60}$ $=50$ $\therefore$ Required number of 5 paise coins $=3\times 50$ $=150$