A SUM OF 36.90 IS MADE UP OF 90 COINS THAT ARE EITHER 20 PAISE COINS OR 50 PAISE COINS.FIND OUT HOW MANY 20 PAISE COINS ARE THERE IN TOTAL AMOUNT.
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let's take no of 20 paisa coins as x and 50 paisa coins as 90-x. 0.2(x)+0.5(90-x)=36.90
=> 0.2x+0.5(90)-0.5x=36.90
=> 45-0.3x=36.90
=>45-36.90=0.3x
=>8.10 =0.3x
=> 8.1/0.3 =x
=>x=27 coins. there are 27 20 paisa coins and 63 50 paisa coins in total amount.
=> 0.2x+0.5(90)-0.5x=36.90
=> 45-0.3x=36.90
=>45-36.90=0.3x
=>8.10 =0.3x
=> 8.1/0.3 =x
=>x=27 coins. there are 27 20 paisa coins and 63 50 paisa coins in total amount.
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