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Secondary 1 | Maths
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Please help need to submit tomorrow.
Date Posted: 2 years ago
Views: 328
(a)
You are correct already.
3x = 2y
We "cross-divide" the expressions. Look up the internet to see what cross-multiplication and cross-division is all about.
x/y = 2/3
x : y = 2 : 3
You are correct already.
3x = 2y
We "cross-divide" the expressions. Look up the internet to see what cross-multiplication and cross-division is all about.
x/y = 2/3
x : y = 2 : 3
(b)
3x/5 = 4y/7
21x/35 = 20y/35
21x = 20y
Cross-dividing,
x/y = 20/21
x : y = 20 : 21
Try on your own the remaining two in a similar way, but first convert them into fractions of the same denominator like what you did.
[There's a model diagram working for it, but I won't go into drawing models]
(c) final answer is 10 : 3
(d) final answer is 1 : 2
3x/5 = 4y/7
21x/35 = 20y/35
21x = 20y
Cross-dividing,
x/y = 20/21
x : y = 20 : 21
Try on your own the remaining two in a similar way, but first convert them into fractions of the same denominator like what you did.
[There's a model diagram working for it, but I won't go into drawing models]
(c) final answer is 10 : 3
(d) final answer is 1 : 2
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