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3 years ago

If you can solve 20 multiplication facts in one minute how long will it take to solve 50 facts

Mathematics

2 answers:

Ad libitum [116K]3 years ago

8 0

If you can solve 20 multiplication facts in one minute then you could solve 50 multiplication facts in 3 minutes

1 minute = 20 facts

2 minutes = 40 facts

3 minutes = 60 facts

We can check our work by doing the unit rate:

60 facts ÷ 3

____________ <--- fraction bar

3 minutes ÷ 3

= 20 facts

__________ (20 facts per minute)

1 minute

mezya [45]3 years ago

5 0

Answer:

150s or 2 min and 30 s

Step-by-step explanation:

20 facts = 1 min

10 facts = 30s

50 facts = ? min

50 / 10 = 5

30 * 5 = 150s

150s = 2 min and 30 s

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You have to get rid of surds in the denorminator by multiplying it with the opposite sign :

$\frac{ \sqrt{5} + \sqrt{3} }{ \sqrt{5} - \sqrt{3} }$

$= \frac{ \sqrt{5} + \sqrt{3} }{ \sqrt{5} - \sqrt{3} } \times \frac{ \sqrt{5} + \sqrt{3} }{ \sqrt{5} + \sqrt{3} }$

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