Question

There should be an equal number of wafers in Box 1 and Box 2. Box 1 has 336 and 542 wafers. Box 2 has 478 wafers. How many wafers should be added to Box 2 to make the number of wafers in both the boxes equal?
$336+542=\underset{–}{}\underset{–}{}\underset{–}{}\underset{–}{}+478$
Box 1 Box 2

• A. 400
• B. 401
• C. 398
• D. 300

Answer 1

The correct option is A 400

Total number of wafers in Box 1 $=336+542=878$So, Box 2 should also contain 878 wafers to make the number of wafers in both the boxes equal.
Number of wafers in Box 2 $=478$
Number of wafers to be added to Box 2 $=878-478=400$Hence, 400 more wafers should be added to Box 2 to make the number of wafers in both the boxes equal to 878.