Question

A and B together can complete a work in 30
days. They worked together for 20 days and
B left the work. A completed the rest work
in next 20 days. In how many days can A
alone complete the work ?​

Answer 1

Answer:

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Step-by-step explanation:

Work done by A and B together in 1 day = 1/30

A + B = 1/30 => B = 1/30 - A

A and B worked together for 20 days + A alone completed the remaining work in 20 days = whole work

(A + B )20 + (A )20 = 1

40A + 20( 1/30 – A) = 1

20A = 1 – 20/30

20A = 10/30

A = 1/60

A alone can finish the work in 60 days.

Answer 2

Answer:

White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells.