Eng Jun Jie's answer to Au's Primary 5 Maths Fractions Singapore question.
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let the number of boys be x
Number of girls=1470-x
1/3 × (no. of boys)= 1/4 ×(no. of girls) +105
x/3 =(1470-x)/4 +105
x/3 = 1470/4 -x/4 +105
x/3 + x/4 = 1470/4 +105
4x/12 + 3x/12 = 472.5
7x/12 = 472.5
7x = 472.5 × 12
x = 5670/7
x= 810
Number of girls=1470-x
1/3 × (no. of boys)= 1/4 ×(no. of girls) +105
x/3 =(1470-x)/4 +105
x/3 = 1470/4 -x/4 +105
x/3 + x/4 = 1470/4 +105
4x/12 + 3x/12 = 472.5
7x/12 = 472.5
7x = 472.5 × 12
x = 5670/7
x= 810
Date Posted:
2 years ago
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