Какова масса сахара в 50г р-ра массовой долей 20%?

решите пожалуста.

Нужно выбрать правильный вариант прилагательного/наречия

(с переводом не с интернет-переводчиков или хотя бы отредактированный)

A study was recent / recently carried out into the productivity of 160 engineers. The engineers worked in teams but also did many tasks individual/ individually. The study looked at how frequent /frequently the engineers helped each other. Engineers were also asked to say how high / highly they respected each of their colleagues. The study found that helpful / helpfully engineers received a high / highly level of respect from their colleagues. However, if they gave help but didn't receive much, they were not very productive / productively. Those engineers who accepted help as well as giving it were able to boost their productivity and were also more popular/ popularly with their colleagues.

Пишется ли ь после шипящих на конце глаголов? Сохраняется ли он перед те, ся?

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