Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
Secondary 1 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
revision exercise
Date Posted: 2 years ago
Views: 364
1. cross multiply
11(2a-3b) = 7(a+b)
22a-33b = 7a+7b
15a = 40b
b = (15/40)a = (3/8)a
5b/8a = (5*(3/8)a)/8a = 15/64
2.
let: #of 20-cent coins = a
# of 50-cent coins = b
a+b = 54
20a+50b=2070
2a+5b=207
2a+5b = 207
2a+2b = 108
----------------- minus
3b = 99
b = 33
a = 21
11(2a-3b) = 7(a+b)
22a-33b = 7a+7b
15a = 40b
b = (15/40)a = (3/8)a
5b/8a = (5*(3/8)a)/8a = 15/64
2.
let: #of 20-cent coins = a
# of 50-cent coins = b
a+b = 54
20a+50b=2070
2a+5b=207
2a+5b = 207
2a+2b = 108
----------------- minus
3b = 99
b = 33
a = 21
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Hi, hope this helps. Please let me know if there is any mistake:)
Date Posted:
2 years ago
360 Tutoring Program