Help me solve some math problems! Training new helpers for the fourth grade mathematics mid-term exam questions (please use the appropriate formula to solve)

160÷2=80 (piece)

80+ 10=90 (piece)

A: There are 90 in the first basket.

The total age of the three people this year is: 8 1+9=90 (years old).

After several years, the sum of their ages is: 40×3= 120 (year).

The total aging of three people is: 120-90=3 0 (years old).

Three people have the same age growth, so divide by 3 to get: 30÷3= 10 (year).

6. Buy 6 towels and 9 bars of soap: 18×3=54 (RMB).

Buy 6 towels and 4 bars of soap: 19×2=38 (RMB).

9-4=5 (block)

So five bars of soap are: 54-38= 16 (yuan)

So 1 bar of soap is: 16÷5=3.2 yuan.

1 towel is: (18-3×3.2 )÷2=4.2 (yuan)

3.2+4.2=7.4 (RMB) A: 1 towel and 1 soap, you have to pay 7.4 yuan.