What equivalent ratios are less but equivalent to 40:20?

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?

Find the commission on a $590.00 sale if the commission is 15%.

Siri can type 90 words in 40 minutes about how many words would you expect her to type in 10 minutes at this rate