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)