Question

Va rog primele 3 exerciti dau coroana

Answer 1

ex 1). a) 3/10x400=120
400+120=520
b) 4/5x400=320
400+320=720
c)25/100x400=100
400+100=500
d) 3/8x400=150
400+150=550
e) 13/16x400=325
400+325=725

ex2). a)50/100x300=150
300-150=150
b)100/100x300=300
300-300=0
c)3/25x300=36
300-36=264
d)7/30x300=70
300-70=230
e) 8/15x300=160
300-160=140
f) 40/100x300=120
300-120=180

ex3).
prima zi 1/3 din 48
a doua zi 1/4 din 48
a treia zi = ??
——————
1/3x48=48/3=16 (nr problemelor rezolvate in prima zi)
1/4x48=48/4=12 (nr problemelor rezolvate in a doua zi)

48-16-12=20 (nr problemelor de rezolvat in a treia zi)