mary has 21 coins whose total value is sh.72 . There are twice as many five shilling coins as there are ten shilling coins.The rest are one shillings coins . find the number of ten shillings coins that mary has.
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the number of ten shillings coins = 3 coins
Step-by-step explanation:
Total coins = 21
Let number of ten shilling coin = x
(There are twice as many five shilling coins as there are ten shilling coins)
Hence number of five shilling coin = 2x
number of one shilling coin = y
Equation in terms of number of coins
2x + x + y = 21
3x + y = 21 ........(1)
Equation in terms of value of coins
5 (2x) + 10 (x) + 1 (y) = 72
20 x + y = 72 ....... (2)
Solve equation (1) and (2)
x = 3
y = 12
the number of ten shillings coins = 3 coins
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