1

Problem

Calculate the sum of \$4 20/5 + 2 18/9\$.

2

Step

Given fractions are

\$4 20/5\$, \$2 18/9\$

3

Step

Change the mixed fractions into improper fractions

\$(20 + 20)/5\$ & \$(18 + 18)/9\$

=\$40/5\$ & \$36/9\$

4

Step

Least Common Multiple (LCM) between the denominators

L.C.M 5, 9 = 45

5

Step

Multiply the numerator and denominator of each fraction by a number so that they have the LCM as their new denominator

\$((40 times 9) + (36 times 5))/45\$

6

Step

Add the numerators and keep the denominator are same

\$(360 + 180)/45\$ = \$540/45\$

7

Step

Simplify the fraction we get,

12

8

Sumup

Please summarize steps

Choices

9

Choice-A

This is incorrect because it is not the result of adding \$4 20/5\$ and \$2 18/9\$

Wrong 25

10

Choice-B

This is incorrect because it doesn’t reflect the correct sum either

Wrong 24

11

Choice-C

This is the correct answer because it is the sum of the two mixed numbers \$4 20/5 + 2 18/9\$ = 12

Correct 12

12

Choice-D

This is incorrect. The correct sum is \$4 20/5 + 2 18/9\$ = 12, not 13

Wrong 13

13

Answer

Option

C

14

Sumup

Please summarize choices