найдите величину 12% которой равны 18 м ; 75 м 24 % которой равны 9,6 т ; 42 т

решите две системы способом подстановки

1) 2(х+у)-х=-6,

3х-(х-у)=0;

2) 3(х+2у)-у=27,

4(х+у)-3х=23.

Find mistakes and correct them.

1) Greg and Bob had looked for their dog for two hours
before they found it sleeping under a bench in the park.

2) We had been boating in the lake at 10 o'clock
yesterday morning.

3) She finished cooking dinner by the time her children
returned from school.

4) When Henry opened the door of the living room, his
little brother watched cartoons on TV.

5) Sally took a piece of paper and had written her
phone number on it.

6) We were driving for six hours before we saw a small
hotel beside the road.

7) After my friends left I washed the dishes and
switched on the TV set.

8) What had you been doing at the moment the fire
broke out?

9) How much was your camera costing a year ago?

10) What were Nelly doing while you were doing the
ironing?