He saved $3500 in April. In May, he saved $4200 less than the amount
he spent.
(a) How much is his monthly salary?
(b) How much did he save in May?
Wai Keong’s monthly salary is twice the amount he saved in April.
a. His monthly salary is $7.000
b. He saved $1.400 in May.
Discussion
Given :
Monthly salary = 2 x amount saved in April
He saved $3.500 in April
In May, he saved $4200 less than the amount he spent.
Question :
(a) How much is his monthly salary?
(b) How much did he save in May?
Answer :
a. Monthly salary = 2 x amount saved in April = 2 x $3.500 = $7.000
∴ His monthly salary is $7.000
b. In May, he saved $4200 less than the amount he spent.
Savings = Amount he spent – $4.200
If amount he spent was a, then :
Monthly salary = savings + amount he spent
$7.000 = (a – $.4.200) + a
$7.000 = a – $.4.200 + a
$7.000 = 2a – $.4.200
2a = $7.000 – $4.200
2a = $2.800
a = $1.400
∴ He saved $1.400 in May.
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Detail of Answer
Grade : 7 (JHS)
Subject : Mathematics
Chapter : Numbers
Categorization : 7.2.2
Keywords : monthly salary, savings, spend.