When 9 is subtracted from a number and then divided by 2, the answer is 4
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Answer:
The weight of the 8th plant is 39lb
Step-by-step explanation:
Given:
Average Weight of 7 plants = 23lb
Average Weight of 8 plants = 25lb
Required:
Weight of the 8th plant
To solve this, the total weight of the initial 7 plants need to be calculated;
Substitute 23 for Average and 7 for Number of plants
Multiply both sides by 7
Hence, the 7 plants weigh 161
Represent the weight of the 8th plant with E
When the 8th plant is added;
The sum of the weight becomes 161 + E
And the number of plants becomes 8
The average is calculated as thus
Multiply both sides by 8
Subtract 161 from both sides
Reorder
Hence, the weight of the 8th plant is 39lb