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A tin of biscuits weighs 1 kg 750 g. What is the total weight of 7 such tins?
12.250 kg
12.350 kg
12.050 kg
12.150 kg
12.250 kg
Express 1 kg 750 g as 1.750 kg and multiply by 7: 1.75×7=12.25.
Weight of one tin of biscuits is 1 kg 750 g. The number of such tins is 7.
Totalweight=n×Wtin
Express 1 kg 750 g as 1.750 kg and multiply by 7: 1.75×7=12.25.
Confusing 1 kg 750 g with 1.75 g or forgetting to convert the entire weight into a single unit (kg) before multiplying.
Unit conversion
Convert the weight of one tin from kg and g into a single unit in kg. Since 1000 g = 1 kg, then 750 g = 0.750 kg. Thus, 1 kg 750 g = 1.750 kg.
1 kg 750 g=1.750 kg
Multiplication
Multiply the weight of one tin by the total number of tins, which is 7.
1.750 kg×7=12.250 kg
Verification
Calculate 1.75×7=(1×7)+(0.75×7)=7+5.25=12.25 kg, which matches 12.250 kg.
12.250 kg
A is correct because the product of the weight of one tin (1.750 kg) and the number of tins (7) is 12.250 kg.
This type of unit conversion is foundational for problems in physics involving mass, volume, and distance calculations.
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