exam Maths Puzzle Numerical Ability

solve the equation

x+7 divided by 3 = 37 divided by 15 - x-2 divided by 5


or


x+7/3 = 37/15 - x-2/5

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exam Other Question
Please help w/ the following:

How many real solutions does this nonlinear system have?
{{{x^2+y^2=25}}}
{{{x+y=9}}}


Thank you. hi, can someone help me find the following thank you so much
sin(5pi/3) I think the answer is -square root3/2
cos(7pi/4) I think the answer is square root2/2
tan(5pi/6)
cos(-5