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Each key on the student calculators is 12 millimeters wide, and each key on the demonstration calculator is 4.8 centimeters wide.
Means
When student calculator is 12 millimeters, demonstration calculator= 4.8 cms
When student calculator is 1 millimeter , demonstration calculator [tex] = \frac{4.8}{12} [/tex]
When student calculator is 1 mm , demonstration calculator[tex] = 0.4 cms [/tex]
So, when student calculator are 249 mm, demostration clculator [tex] = 249 *0.4 [/tex]
Means 99.6 cms
Means demonstration calculator is 99.6 cms tall. : Answer
Hope it will help :)
