The last time Meena bought Diwali cards, he found that the three types of cards that he liked were priced Rs.2.00, Rs.3.50, Rs.4.50 each. As Meena wanted 30 cards, she took ten each of three cards , putting down the exact number of 10 rupees notes on the counter payment. How many notes did Meena give? Select the correct option.
A) 5 B) 15 C) 10 D) 12 E) 13
Explanation :   Let the three cards be a, b ,c . 'x' be the number of notes.   Then, according to the question,   =&gt; 10a + 10b + 10c = 10*x.   =&gt; a + b + c= x . -----------------------------(i)   Since, a + b +c= 3.5 + 4.5 +2.0= x   x =10   Answer : 10
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The last time Meena bought Diwali cards, he found that the three types of cards that he liked were priced Rs.2.00, Rs.3.50, Rs.4.50 each. As Meena wanted 30 cards, she took ten each of three cards , putting down the exact number of 10 rupees notes on the counter payment. How many notes did Meena give?