book Maths Puzzle Numerical Ability

On what type of surface can you have a triangle whose angles add to 270 degrees?

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book Other Question

How do I solve this equation using the quadratic formula

3-4/x-2/x2=0

THREE - FOUR OVER X - TWO OVER X SQUARED = ZERO 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?