Answer:
24
Step-by-step explanation:
60% of 50 is equivalent to 24 so he answered 24 questions correctly
Answer:
the numbers are 85 and -31.
Step-by-step explanation:
first, let the numbers be x and y.
so by question we have,
x+y=54.......(I)
x-y=116......(I I)
now, solve it through elimination method,
x+y=54
x-y=116
here, y and y cancelled out and we get,
or, x+x=54+116
or, 2x=170
or, x=170/2
therefore, x=85
now put value of x in any equation. let's put in eqn (I), we get,
or, x+y=54
or,85+y=54
or, y=54-85
so, y= -31
therefore, the numbers are 85 and - 31.
X+5/5=X+9/7
-X. -X
5/5=9/7
there is no solution
the question wnats us to find the correct regrouping strategy for solving 57 x 18
in othe r to get the correct re-grouping strategy, we must first know what it entails.
57 x 18 = 1026
so, the correct regrouping strategy will be the one that will be equal to 1026 when summed up
so,
50x10; 7x10; 50x8; 7x8
= 500 + 70 + 400 + 56
= 1026
therefore the correct option is A