A number theory problem by Anik Mandal

Number Theory Level 2

In the months of March,April and May,my lawn grows 0.7cm everyday.On the day that it reaches a height of 20 cm,I always mow it back to a height of 2.5cm.If I mow my lawn on the first day of March,how many times in total do I need to mow the lawn during these three months?

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The answer is 4.

Anik Mandal by Anik Mandal , 21, India

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2 solutions

Sharky Kesa
Aug 21, 2014

Also in Australian Maths Competition. @Anik Mandal

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@ first starting at 2.5 cm...... therefore 20-2.5=17.5 ......and 17.5/0.7 =25 days........so every 25 days he will mow.......so there will be 3 mows+1mow on the first day of march.....therefore total mows =4

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