exam Maths Puzzle Numerical Ability

In triangle JKL,the measure of angle j is 30 degrees less than the measure of angle K and measure angle L=80. find measure angle K.

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My question is how to solve:
2x+1<3x<12
The 14 digits of a credit card are written in the boxes shown. If the sum of any three consecutive digits is 20, what is the value of A?

A _ 7 _ _ _ _ _ _ _ _ 7 _ 4