Exam Maths Puzzle Numerical Ability

1,11,21,1211,111221, __
a-312211
b-1112221
c-1112222
d-1112131

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Exam Other Question

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits
Gold is 19 times heavier than water. Copper is 9 times heavier than water. In what ratio should they be mixed so that the alloy is 15 times heavier than water?