Question

Four children write a test. The average mark of them was 80%.A fifth child joins the group with test mark 40%. What is their new average
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Answer 1

Resposta:

72%

Explicação passo-a-passo:

hypothetically, the first four students scored 80.

80+80+80+80 = 320/4 = 80%

so let's say the fifth student got a 40.

80+80+80+80+40= 360/5 = 72%