1/4 x 3
= (1x3) / 4
= 3/4
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One quarter "of" something is, mathematically, one quarter "times" something - so you simply multiply 1/4 x 40.
To divide by a fraction, multiply by its reciprocal. In this instance, 3/4 / 3/5 = (3/4 x 5)/3 = 1 1/4 or one and one quarter.
One quarter of three eighths is three thirty-seconds. So, basically, you're taking a slice of a slice and ending up with a teeny-tiny piece. It's like trying to split a crumb into even smaller crumbs - not much to work with!
One-third .
Two thirds of five and a quarter are three and one half. Five and a quarter is 21/4. Two thirds is 2/3. Multiply the two together and you get 42/12. Reduce to 7/2, and convert back to normal form to get 3 and 1/2.