500÷5=100 I do 500 into 5 give 100
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Answer:
10
Explanation:
Make our unknown equal to x, in this case his current age.
In 20 years he will be three times as old as he is now, in other words:
x + 20 = 3x
Now solve the equation:
20 = 3x - x
20 = 2x
10 = x
You have
for all
, and dividing by
gives
, or
. By the racetrack principle, then, it follows that
.
