Description
How to solve m/3n + 2/7n , I know the answer is 7n+6/21n but How did you get there? the app im using only says "cross multiply" to which iam getting 7nm+6n/21n^2.
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Explanation & Answer
For this one you have to first find the least common denominator:
each denominator factors as follows
(3)(n) and (7)(n)
so they already have n in common, but because 7 and 3 cannot be further broken down,
they are multiplied to form 21, ......so (21)(n) is your least common denominator
then you have to multiply the fraction on the left by (7)/(7) and the fraction on the right by (3)(3), which would give you the right answer . multiplying by 1 does not change the value of each fraction but gets them into terms where you can add. You can't cross multiply with
addition of fractions
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MT217 Finance methods of calculation
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