Question

a+(c+d)=(a+b)+d
a=2/5,b=3/7,c=6/7
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Answer 1

Answer:

A:B=2:3，B:C=4:5，C:D=6:7

↓

A:B=（2×8）:（3×8）=16:24

B:C=（4×6）:（5×6）=24:30

C:D=（6×5）:（7×5）=30:35

↓

A:B:C:D=16:24:30:35

↓

A:D=16:35

Answer 2

Step-by-step explanation:

teacher can modify these tools according to the need and level of students. Page 5. Class III (EVS). Learning Outcomes