book Maths Puzzle Numerical Ability

A triangle can be formed having side lengths 4,5,& 8. It is impossible, however, to construct a triangle with sidelengths 4,5 & 10. Using the side lengths 2,3,5,7 & 11, howmany different triangles with exactly 2 equal sides can be formed?

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book Other Question

seven times a number is the same as 12 more than 3 times the number. Find the number. we have to write an equation plus solve it. Solution A is 8% acid and Solution B is 4% acid. If a technician wants to mix them to make 150 liters of Solution C which is 6% acid, how many liters of each should be mixed together?
thanks for the help!