What would you multiply the fraction 12/28 by to make the product equal 1

What is 32+4 x (16 x 1/2) -2 show your work}

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.