Сумма трех чисел равна 100. найдите их, если первое число составляет 50% от другого, а другое 40% от третьего.
пусть третье число равно x, тогда второе равно 0,4*x и первое равно 0,5*(0,4*x)=0,2*x
тогда
0,2x+0,4x+x=100
1,6x=100
x=62,5 - третье число
0,4x=25 – второе число
0,2x=12,5 – первое число
i usually get up at 7 am. i clean my teeth, wash my face and my hands with cold water.
then i go to my room and make my bed. i get dressed and brush my hair.
i have breakfast with my father. after breakfast i dress my school uniform.then i put my books and copy-books into my schoolbag and go to school.
at 8 a.m. i go to school and have lessons till 14 p.m.
at 2 p.m. i have dinner.
after dinner i go for a walk with my friends. then i do my homework.
at 7 p.m. my family and i have supper together.
then i read books, watch tv or play computer games.
at 9 p.m. i take a shower and go to bed. usually i sleep well.