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cesarcastellan9
02.07.2019 •
Mathematics
Devi and her brother had the same amount of money. after devi spent 2/5 of her money and her brother spent 3/10 on his money, they had 78$ left altogether. how much money did they spend altogether?
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Ответ:
Let us assume Devi or her brother amount = $x.
Devi spent 2/5 of x, that is 2/5 x.
Remaining amount of Devi = x- 2/5 x = 5x/5 - 2x/5 = 3x/5.
Her brother spent 3/10 of x, that is 3/10 x.
Remaining amount of her brother = x- 3/10 x = 10x/10 - 3x/10 = 7x/10.
Total amount they left together = $78.
Therefore,![3x/5\:+\:7x/10\:=\:78\:](/tpl/images/0041/0104/bbbcd.png)
Multiply equation by LCM 10.
![x=60](/tpl/images/0041/0104/79ea7.png)
Therefore, each one spent $60 and they spent altogether = 60+60 = $120.Ответ:
1.6 for the 1st question and 6.4 for the 2nd one
Step-by-step explanation: