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BECE Mathematics 2013 Paper
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© africaexams.com
Question : 23
Total: 40
Evaluate
20
a
−
b
, if
a
=
30
and
b
=
1
.
−
1
2
3
−
1
3
1
3
1
2
3
Validate
Solution:
20
a
−
b
a
=
30
and
b
=
1
Substitute the values into the expression and simplify.
20
a
−
b
=
20
30
−
1
Every whole number is being divided by 1 which is not written.
1
=
1
1
20
a
−
b
=
20
30
−
1
1
20
30
−
1
1
=
1
×
20
−
1
×
30
30
20
30
−
1
1
=
20
−
30
30
20
30
−
1
1
=
−
10
30
=
−
1
3
Note: 10 divides itself once and 30,3 times or the zeros cancel each other.
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