snell's answer to Soni's Primary 5 Maths question.
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8.
Average of 3 = 85
total = 85 x 3 = 255
English = 87
Math = ? tens + 6 ones
Science = 7 tens + ? ones
Math & Science = 255-87 = 168
168 - 7 tens = 98
98 - 6 ones = 92
92 = 9 tens and 2 ones
hence,
Math = 9 tens + 6 ones = 96
Science = 7 tens + 2 ones = 72
Average of 3 = 85
total = 85 x 3 = 255
English = 87
Math = ? tens + 6 ones
Science = 7 tens + ? ones
Math & Science = 255-87 = 168
168 - 7 tens = 98
98 - 6 ones = 92
92 = 9 tens and 2 ones
hence,
Math = 9 tens + 6 ones = 96
Science = 7 tens + 2 ones = 72
Date Posted:
6 years ago
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