Others Maths Puzzle

make 100 with 6 9's . i.e 9,9,9,9,9,9

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Others Other Question

Q. Which is a solid fuel?
a. Petrol
b. Diesel
c. Wax
d. Wood
how many pure salt must be added to 30kg of 2% solution of salt and water to increse it to a 10% solution?
give the proper solution?