Using cross multiplication solve these
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70 / A-B = 7
10 =A-B ------------1
70/ A+B =1
70 =A+B -----------2
1+2
80 =2A
A=40
and 10 =40 -B
B=40-10=30
10 =A-B ------------1
70/ A+B =1
70 =A+B -----------2
1+2
80 =2A
A=40
and 10 =40 -B
B=40-10=30
mN21:
using cross multiplication
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