Source: Veritas Prep
In the last week, Todd has lost 12 pounds and now weighs exactly three times as much as his younger brother. Together they weigh 280 pounds. How much did Todd weigh a week ago, in pounds?
A. 210
B. 213
C. 220
D. 222
E. 225
The OA is D
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In the last week, Todd has lost 12 pounds and now weighs exactly three times as much as his younger brother...
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BTGmoderatorLU
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E
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deloitte247
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Let Todd's weight = t
Let his younger brother = b
t - 12 = 3b
t - 3b = 12 --- eqn (1)
(t - 12) + b = 280
t + b = 280 + 12 = 292
t + b = 292 --- eqn (2)
t = 292 - b --- eqn (3)
Substitute eqn (3) into eqn (1)
292 - b - 3b = 12
-4b = 12 - 292
-4b = - 280
$$b=\frac{-280}{-4}=70$$
t = 292 - 70 = 222
Answer = option D
Let his younger brother = b
t - 12 = 3b
t - 3b = 12 --- eqn (1)
(t - 12) + b = 280
t + b = 280 + 12 = 292
t + b = 292 --- eqn (2)
t = 292 - b --- eqn (3)
Substitute eqn (3) into eqn (1)
292 - b - 3b = 12
-4b = 12 - 292
-4b = - 280
$$b=\frac{-280}{-4}=70$$
t = 292 - 70 = 222
Answer = option D
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Solution:BTGmoderatorLU wrote: ↑Mon Oct 19, 2020 4:49 pmSource: Veritas Prep
In the last week, Todd has lost 12 pounds and now weighs exactly three times as much as his younger brother. Together they weigh 280 pounds. How much did Todd weigh a week ago, in pounds?
A. 210
B. 213
C. 220
D. 222
E. 225
The OA is D
We can let t = Todd’s old weight and b = his brother’s current weight.
We can create the following equations:
t - 12 = 3b
And
t - 12 + b = 280
Replacing t - 12 in the second equation by 3b, we have:
3b + b = 280
4b = 280
b = 70
Substitute b = 70 back into the very first equation, we have:
t - 12 = 3(70)
t = 222
Alternate Solution:
Let’s let x = brother’s current weight. This means that Todd’s current weight = 3x. We have:
x + 3x = 280
4x = 280
x = 70
Todd’s brother weighs 70 pounds, and Todd currently weighs (3)(70) = 210 pounds. Last week Todd weighed 12 more pounds, so last week he weighed 222 pounds.
Answer: D
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