A bag contains 25-paise, 50-paise and l-rupee coins in the ratio 8 : 2 : 7. If the total value of all the coins in the bag is Rs. 770, then find the total number of all the 25 paise and 50 paise coins in the bag.

<p>The bag has 25-paise, 50-paise and 1 -rupee coins in the ratio 8 : 2 : 7. Now this is the ratio of the number of coins while the total value of the coins has been given. So we first need to convert coins into value.</p><p>Let the coins be 8x, 2x and 7x respectively.</p><p>8x coins of 1/4 rupee each = value is Rs. 2x.</p><p>2x coins of 1/2 rupee each = value is Rs. x.</p><p>7x coins of 1 rupee each = value is Rs. 7x.</p><p>Now</p><p>2x + x + 7x = 770</p><p>10x = 770 x = 77</p><p>Number of 25 paise and 50 coins = 10 x = 770 coins</p>

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