i need answer only from $1$ to $20,$ answer the questions for thumps up please,

$1.$ a head required of $40$ ft $,$ what are the suitable impellers?

$2.$ For a pump of impeller of $216$ mm running at a head available of $40$ ft $,$ what is volume flow rate?

$3.$ For a head required of $80$ ft $,$ what are the suitable impeller diameters? $4.$ For a volume flow rate of $300$ gpm from $6\mathrm{.}75$ in$-$impeller pump, what is the efficiency?

$5.$ For $11\mathrm{.}25$ in$-$impeller pump, what are the flow rate and head for best efficiency?

$6.$ What is the best impeller to choose for the pump?

$7.$ What is the efficiency for the best impeller for the pump?

$8.$ What is the head for the best impeller for the pump?

$9.$ What is the volume flow rate for the best impeller for the pump?

$10.$ What is the required power for the best impeller for the pump?

$11.$ What is the efficiency for $8\mathrm{.}25-$in impeller pump running at a head of $20?$

$12.$ What is the maximum power to operate $8\mathrm{.}25-$in impeller pump?

$13.$ For $8\mathrm{.}25$ in$-$impeller pump, what is the range of efficiency?

$14.$ What is the maximum efficiency for $216-$mm impeller pump?

$15.$ What is the lowest efficiency for $12\mathrm{.}75$ in impeller pump?

$16.$ What is the available head at the lowest efficiency for $12\mathrm{.}75$ in impeller pump?

$17.$ What is the volume flow rate at the lowest efficiency for $12\mathrm{.}75$ in impeller pump?

$18.$ What other impeller sizes that can achieve the same head at the lowest efficiency for $12\mathrm{.}75$ inimpeller pump?

$19.$ What is range of power required to operate $11\mathrm{.}25$ in$-$impeller pump for a flow rate from $200$ to $500$ gpm$?$

$20.$ At what head and volume flow rate the efficiency is the lowest for the smallest impeller?