Question

4. 30 identical dictionaries have a combined mass of 50 kg. Find:
(a) the combined mass of 24 such dictionaries, and
(b) the number of dictionaries that have a combined mass of 75 kg.
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Answer 1

Step-by-step explanation:

30 dictionaries mass = 50 kg

1 dictionary mass= 50/30= 5/3 kg

Mass of 24 dictionary = 5/3*24

5*8= 40 kg

b) let the no. of dictionary req. be x

so x*5/3= 75kg ( one dictionary mass * x dictionary=75)

X= 75*3/5= 15*3= 45

so 45 dictionary will weigh 75 kg