![]() If there are, the correct answer is "Cannot be determined." Therefore, we have to check whether answer D fits the terms as well. Why is that? Because maybe there are two correct answers. Although it fits the information the answer "Cannot be determined" is a trap. In 4 years Jade will be twice as old as Rose.Īnswer B is correct because if Jade is now 14 and Rose is 5, in 4 years' time Jade will be 18 and Rose will be 9.ġ8 is twice as much as 9 so this can be the right answer. The second relation between the ages will help. How can we determine which one of them is the correct answer? Furthermore, Jade has to be the older one. We need to find two different ages, with a 9-year gap between them. All we have to do is to check which of the values from the answers fits into the right terms that the question states. We do not need to try and find the answers ourselves because one of the answers is correct (and if not, the alternative "Cannot be determined" is correct). The question asks about their ages, and the alternatives offer different ages to choose from. The first variable (X) is isolated in the first equation so we can insert its value in the second equation by denoting X as an expression of Y.Īnother method: Is understanding the relation between the ages too difficult? You can't convert them into equations properly? There is another way to solve this question without all those calculations. Now we have two different equations with 2 variables. It means that in 4 years Jade's age will be X+4 and will be double Rose's age, which will be Y+4. "In 4 years' time, Jade's age will be double Rose's age" - the second sentence also represents a relation. Unfortunately, an equation with two variables is not solvable unless we have another equation. "Jade is 9 years older than Rose " - we can translate this information into an equation. Let's denote Jade's age by X and Rose's age by Y. ![]() ![]() All the information given is based on the relation between Jade's age and Rose's age. Angles, dots, and triangles are the only options left.Īlthough angles and dots are a part of shapes, they do not constitute as shapes. ![]() Option D, rulers, can also be eliminated as rulers may assist us in creating shapes, but they are not a shape. Options B, dimensions, can be eliminated because it is a characteristic of a shape, not a type of one. Dimensions are a specific kind of shape.Į. Now, we can try to apply this relation to shapes:ī. Thus, we should phrase a sentence to define what X is to Y. Creating a sentence with the first pair of words and applying it to the second pair is a useful method for solving this type of question. To solve this questions correctly, it is necessary to understand the relationship between X and Y (oranges and fruits). Number of values X Average=Sum of the values. Quick tip: If an average is provided followed by the number of values, the sum of the values can be calculated. If the value of three of them is $330, the average price is $110. If the value of the Drone stock is $70, we can conclude that the sum of the remaining three stock prices is $330. The average of the 4 stock prices is $100, and therefore the sum of the stock prices is $400. Let's insert the figures that we know into the formula. We can calculate the sum of the group's value with the average of the values: Now, find the sum of the prices of all the stocks (Sum of the individuals' value). We know that there are four different stocks, so the number of individuals is four (Number of individuals). In order to calculate an average, we have to know the sum of the individual values, and the number of individuals. Therefore, the only possible answer is F - none of the above. 57 + 16*(17-5) = 227, which means we can eliminate C as an answer. 37 + 16*(17-3) = 245, which means we can eliminate B as an answer. Now that we are left only with B and C, let's try to calculate it for each of these options: For starters, since 191 is an odd number and 16 is an even number, then the number of used cars must be odd (even+odd=odd) - which means we can eliminate answers A, D & E. Solving Tip: You could try solving this question by elimination. So according to the second equation N = 17-U, and we can now substitute N in the first equation: 7U+16(17-U)=191 7U+272-16U=191 9U=81 U=9. Now we define the used cars as U (with a price of 7 each) and the new cars as N (with a price of 16 each) Now we can build two equations, the first representing the total price and the second the total amount of cars: The correct answer is (F) - None of the above.įirst of all, in order to simplify the calculations we can divide all the numbers by a common denominator: 1000, in that way we can get rid of all those annoying zeroes.
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