Дед привез на рынок 420 кг яблок и 180 кг груш, в 50 одинаковых ящиках . Сколько было ящиков с грушами а сколько с яблоками.

Put the verbs in brackets into the past simple or the past continuous. A. As soon as Margaret 1) ... (get) off the train, she 2) ... (pull) her coat around her. Rain 3) ... (fall) heavily and a cold wind 4) ... (blow) across the platform. She 5) ... (look) around, but no one 6) ... (wait) to meet her. She 7) ... (turn) to leave when she 8) ... (hear) footsteps. A man 9) ... (walk) towards her. He 10) ... (smile) at her, then he 11) ... (say), “You’re finally here”. B. George 1) ... (pick) up his bag then, 2) ... (throw) it over his shoulder. It 3) ... (get) dark and he 4) ... (have) a long way to go. He wished that he had let someone know that he was coming. It 5) ... (start) to rain, and he was feeling cold and tired from the long journey. Suddenly, he 6) ... (hear) a noise, then he 7) ... (see) two bright lights on the road ahead. A car 8) ... (head) towards him. It slowed down and finally 9) ... (stop) beside him. A man 10) ... (sit) at the wheel. He 11) ... (open) the door quickly and 12) ... (say) “Get in, George”.

вам дано каструлю з внутреннем обьёмом 2 литра, ведро з водой и чайник, У необходимо как можно точнее выделить з ведра воду обьёмом 1 литр. Как это можно зделать????

упростите выражение 

6,8+2cos(в квадрате)х, если sinx=0,5