exam Maths Puzzle Numerical Ability

find the largest two-digit number which is equl to four times the sum of its digits

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exam Other Question

Can I have some help with a study guide question?

A large solar hearing panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or
write the equation in the slope intercept form for the line passing through (2,1) and (-1,3)

I know that slope intercept form is y=mx+b
and the slope is -2/3

any help?