f.1 maths_11
2017/07/04 04:17
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f.1 maths
in 代數方程1. Donna buys some $2 stamps and some $5 stamps.If she spends $54 altogether and gets 15 stamp, now how many $2 stamp does she buy?2.A cash voucher,either $200 or $300,is given to eash of 45 staff members.If the total amount of thes vouchers given is $11800,find the nuber of staff members who receive a... 顯示更多 in 代數方程 1. Donna buys some $2 stamps and some $5 stamps.If she spends $54 altogether and gets 15 stamp, now how many $2 stamp does she buy? 2.A cash voucher,either $200 or $300,is given to eash of 45 staff members.If the total amount of thes vouchers given is $11800,find the nuber of staff members who receive a $200 voucher.
最佳解答:
1. Let x be the numbers of $2 stamp she buys. So, (15 - x) is the number of $5 stamp she buys Total value = $54 So, 2x + 5(15 - x) = 54 2x + 75 - 5x = 54 -3x + 75 = 54 -3x = 54 - 75 -3x = -21 x = 7 So, she buys 7 $2 stamp. 2. Let y be the numbers of staff who receive a $200 voucher, so (45 - y) is the number of staff who receive a $300 voucher Total value = $11 800 200y + 300(45 - y) = 11 800 2y + 135 - 3y = 118 -y = 118 - 135 -y = -17 y = 17 So, there are 17 staff who receive a $200 voucher.
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f.1 maths
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發問:in 代數方程1. Donna buys some $2 stamps and some $5 stamps.If she spends $54 altogether and gets 15 stamp, now how many $2 stamp does she buy?2.A cash voucher,either $200 or $300,is given to eash of 45 staff members.If the total amount of thes vouchers given is $11800,find the nuber of staff members who receive a... 顯示更多 in 代數方程 1. Donna buys some $2 stamps and some $5 stamps.If she spends $54 altogether and gets 15 stamp, now how many $2 stamp does she buy? 2.A cash voucher,either $200 or $300,is given to eash of 45 staff members.If the total amount of thes vouchers given is $11800,find the nuber of staff members who receive a $200 voucher.
最佳解答:
1. Let x be the numbers of $2 stamp she buys. So, (15 - x) is the number of $5 stamp she buys Total value = $54 So, 2x + 5(15 - x) = 54 2x + 75 - 5x = 54 -3x + 75 = 54 -3x = 54 - 75 -3x = -21 x = 7 So, she buys 7 $2 stamp. 2. Let y be the numbers of staff who receive a $200 voucher, so (45 - y) is the number of staff who receive a $300 voucher Total value = $11 800 200y + 300(45 - y) = 11 800 2y + 135 - 3y = 118 -y = 118 - 135 -y = -17 y = 17 So, there are 17 staff who receive a $200 voucher.
其他解答:
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