exam Maths Puzzle Numerical Ability

Find the surface area of each pyramid to the nearest whole number?

11in. = slant height
12in. = perimeter

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exam Other Question

birth weights are normally distributed with the mean of 3570g and a standard deviation of 495g. if a hospital wants to watch carefully the lightest 2% of infants, find the weight that seperates the bottom 2% from others. What quantity x of a 75% acid solution must be mixed with a 25% solution to produce 500 ml of a 55% solution?

I have tried these equations
.75x+.25(.55*500)=500(.55)