exam Maths Puzzle Numerical Ability

Allen bought 20 stamps at the post office in 0.37 and 0.20 denominations. If the total cost of stamps was $7.06, how many 0.37 stamps did allen buy?

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I would really appreciate it if someone could help me solve this problem, write the equation of the line perpendicular to y=1/3x+5 and contains the point(1,4). The final equation has to be expressed in standard form.

Thank you,
Brina 1.2< absolute value of 3/5-3x and +1
graph and interval notation.