2, accounting for the total proportion.

3.120/(3+4+5) =10a:10 * 3 = 30 bottles B: 10*4=40 bottles C: 10*5=50 bottles.

4.144/(5+3+4) =12a:12 * 5 = 60 (yuan) B: 12*3=36 yuan c:12 * 4 =

5. The ratio of the lengths of three sides of a triangle is 3:4:5, which means it is a right triangle.

60/(3+4+5) = 53 * 5 =15cm 5 * 4 = 20cm area: 15 * 20/2 = 150m2.

6,6/3 = 211* 2 = 22cm area: 22 * 6 = 132cm2.

7. 15*5/7 I think there is something wrong with the problem. It should be number b 15.

2, 30/(3+2)=6 3*6= 18 (person) 2*6= 12 (person)

3, 240/(7+5)=20 5 years: 20*7= 140 (Ben) 6 years: 20*5= 100 (Ben)

4、20 * 2 = 10 10/(4+ 1)= 22 * 4 = 8 cm2 * 1 = 2 cm2 8 * 2 = 16 cm2。

5、32/4 = 8cm 8/(4+3+ 1)= 1 * 4 = 4cm 1 * 3 = 3cm 1 * 1 = 1cm。

(4 * 3+4 * 1+3 * 1)* 2 = 38 cm2)