self Maths Puzzle

how many 4 digit odd no's can be formed such dat every 3 is followed by a 6???

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self Other Question

A toy weighing 24 grams of an alloy of two metals is worth Rs. 174, but if the
weights of metals in alloy be interchanged, the toy would be worth Rs. 162. if the price of one metal be Rs 8 per gram, find the price of the other metal used to make the toy
There are 20 balls which are red,blue or green.if 7 balls are green and the sum of red and green balls is less than 13,at most how many red balls are there?
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