radha needs 72 ice -creams for a party.For every 5 ice -creams he buys,he gets one free.How many ice-creams will he need to buy for?
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Solution
For every 5 ice-creams she gets one free ice-cream.
This means when she buys 12 set of 5 ice-creams i.e. ice-creams she gets 12 ice-creams free.
This adds up to 12 + 60 = 72 ice-creams
Therefore she needs to buy 60 ice-creams.