book Maths Puzzle Numerical Ability

2x-15/6=x/9+3x/4

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book Other Question

RATIONAL THE DENOMINATOR

3 SQUARE ROOT DIVIDED BY 6 SQR ROOT + 3 SQR ROOT

3 SQR ROOT DIVIDED BY 4 3SQR ROOT - 5

ASLO:

SOLVE:

3X SQR ROOT-1 -3=5
i have no idea where to begin on this question. it is on a worksheet:
the measures of the angles in a triangle are in the ratio 2:5:8. Find the measures of the angles.