1 and a 1/2
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Half of 50 is 25 and twice of that is 50. So 50.
The answer is one-half. It is twice as much as one-fourth. Consider one as a whole. If you divide it into two parts, you will get one half (1/2), if into three parts, you will get 1/3 (one-third), if into 4 parts, you will get 1/4 (one-fourth).
half a number
No it's half the diameter
If Mike is 6 years old and twice as old as his brother, then his brother is 3 years old. When Mike is one and a half times his brother's age (1.5 * 3 = 4.5), he will be 4.5 years older than his brother. Therefore, Mike will be 6 + 4.5 = 10.5 years old when he is one and a half times his brother's age.