Posted by **Unknown.** on Thursday, October 28, 2010 at 4:55am.

There are 420 calories in 2 1/4 cans of grape soda. How many calories are in 1 can of soda?

- Math. -
**Ivan**, Thursday, October 28, 2010 at 6:29am
420cal = 2.25 cans

? cal = 1can

To find the number of calories we just do the cross product, so:

420cal x 1can / 2.25cans = ? cal

420cal/2.25cans = 186.6667cal

- Math. -
**jai**, Thursday, October 28, 2010 at 8:23am
you have to divide 420 by 2 1/4,, to do this, you must first convert 2 1/4 into improper fraction:

2 1/4 = 9/4

*note that to convert mixed number into improper fraction, multiply the denominator (which is 4) by the whole number (which is 2), then add the numerator (which is 1), thus 4*2 + 1 = 9, but the denominator is still 4, thus it's 9/4,,

then divide:

420 / (9/4)

*to do this, get the reciprocal of 9/4, that is, interchange numerator and denominator:

9/4 --> reciprocal is 4/9

now, the operation becomes multiplication instead of division:

420 * (4/9) = ?

you simplify this.

so there,, :)

- Math. -
**Unknown.**, Thursday, October 28, 2010 at 6:30pm
Thank you Ivan and Jai.

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