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Step-by-step explanation:
1)Cost of one cake=Rs.200
Cost of 3/4 th of the cake=(3/4)×200
=>(3×200)/4
=>600/4
=>150
The cost of 3/4th of the cake=Rs.150
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2)Total number of marbles in a box=84
Number of red marbles=1/4 th of total marbles
=>(1/4)×84
=>84/4
=>21
Number of red marbles in the box=21
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