Posted by **Sonya** on Saturday, February 9, 2008 at 5:51pm.

I need help please

A computer can execute 64 instructions per second. How many instructions can it execute in 10 minutes?

Multiply 3 1/6 x 9/11 x 6/17. Write the answer in simplest form

Divide 6/25 / 2/15. Write the result in simplest form.

- Math -
**Ms. Sue**, Saturday, February 9, 2008 at 7:56pm
64 * 60 * 60 * 10 = ?

3 1/6 x 9/11 x 6/17

19/6 * 9/11 * 6/17 = ?

Multiply the numerators and then multiply the denominators. The numerator in the answer is 1026.

6/25 / 2/15

6/25 * 15/2 = ?

- Math -
**Guido**, Sunday, February 10, 2008 at 2:47pm
I will solve one of the questions only.

A computer can execute 64 instructions per second. How many instructions can it execute in 10 minutes?

Let x = the number of instructions in 10 minutes.

We use the following proportion:

64 instructions/x instructions = 1 second/600 seconds

In short, we can write it this way:

64/x = 1/600

Where did 600 come from?

I multiplied 10 minutes by 60 seconds per minute.

64/x = 1/600

Cross-multiply and solve for x.

x = 64 x 600

x = 38,400

Done!

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