book Maths Puzzle Numerical Ability

A piggy bank contains 5-centavo and 10-centavo coins amounting to PHP 30.50. If there are 19 more 5-centavo coins than 10-centavo coins, how many coins are in the piggy bank?

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book Other Question

On what type of surface can you have a triangle whose angles add to 270 degrees? I need help with a question, Find the value of a in the equation

5
--- =
a+3

3
---
a-2

I think the answer is a= 2 3/8

Am I right, Can someone let me know?