GROWTH DEVELOPMENT CHILD
MEASUREMENT OF INTELLIGENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hakimi, who is sixteen years old, is four times as old as his sister. How old will Hakimi be when he is twice as old as his sister?
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20
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24
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25
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I dont know
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Explanation:
Detailed explanation-1: -16 / 4 = 4 so Mary is 16; her brother is 4. Mary will be twice as old as her brother when the age of her brother is equal to the number of years between their ages. 16 – 4 = 12 so Mary will be twice as old as her brother when her brother is 12. 12 + 12 = 24 so Mary will be 24.
Detailed explanation-2: -In English, “four times older” means “five times as old as". So, if “x” is the son’s current age, then the father’s current age is 5x, according to the condition and correct interpretation. In 14 years . . . 5x + 14 = 2*(x+14) 5x + 14 = 2x + 28 5x-2x = 28-14 3x = 14 ====> x = 14/3 is not an integer number.
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