exam Maths Puzzle Numerical Ability

Hi I need help :(

Page 196

Number 18

Five more than one-third of a number

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exam Other Question

are equations are like this 13.7b-6.5=-2.3b+8.3 and i dont understand how to do these kind of problems. also we have some fractions like this 3/2y-y=4+1/2y and some parenthisis lik If a triangle has two angles that measure 59 degrees and 100 degrees, what is the measure of the third triangle?