18 to 29=10%

30 to 49=30%

Suppose Max knows that 45 people with ages of 18 to 29 voted. Without using a calculator he then says 135 people with ages of 30 to 49. Is he correct? How might Max have come up with his answer so quickly?

Question

Mathematics

Sydney Munoz

24 July, 13:37

18 to 29=10%

30 to 49=30%

Suppose Max knows that 45 people with ages of 18 to 29 voted. Without using a calculator he then says 135 people with ages of 30 to 49. Is he correct? How might Max have come up with his answer so quickly?

+2

Answers (1)

Know the Answer?

Vaughn Wilkinson · Answer 1

45 people is 10% of 450.

So how many people is 30% of 450.

1. Multiply (45) (3) = 135. Because 30% is 3 times 10%.

2. Multiply (450) (.3) = 135. Because. 3 = 30% in decimal form.

18 to 29=10%30 to 49=30%Suppose Max knows that 45 people with ages of 18 to 29 voted. Without using a calculator he then says 135 people with ages of 30 to 49. Is he correct? How might Max have come up with his answer so quickly?

18 to 29=10%

30 to 49=30%

Suppose Max knows that 45 people with ages of 18 to 29 voted. Without using a calculator he then says 135 people with ages of 30 to 49. Is he correct? How might Max have come up with his answer so quickly?