If you can figure these questions correctly, i will make you

a salesman mixed two kinds of candies worth $1.25 and $1.6 a pound, respectively. he made a mixture of 70 pounds to sell at $1.4 a pound. how many pounds of each did he use?

a grocer has 18 kg of black tea worth $3.5 per kg. she wants to mix it with green tea worth $2.6 per kg to sell the mixture at $2.9 per kg. how much of green tea should she use?

how many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to obtain a mixture containing a 40% solution of acid

for the next rsm award ceremony, it was decided to decrease the length of the main poster by 12% and to increase its width by 15%. by how many percent did the poster's area change? did it increase or decrease

just solve as many as you can, it will be